Software libre

Siempre se tienen problemas con las bases de datos siempre se ponen con el hecho de optimizar y conseguir mas rendimientos
Yo últimamente me decanto mas por bases de datos de NoSql estoy cambiando las de Oracle Oracle por Hadopp o Casandara y mysql por Neo

pero siempre quedan sitio para las tradicionales como MySql y siempre estoy con lo mismo ademas como en los sitios donde trabajo ya sea por desconocimiento o por reducción de bastos el perfil de DBA no lo cubren así que siempre ando con el tema de las bases de datos ahora pongo algunas cosas que suelo usar.

Ahora adjunto algunos consejos para las  tunning para mysql son muy conocidos pero al final siempre vienen bien conocerlos

1. Usar el comando Explain

El comando Explain explica como se lleva a cabo una consulta SELECT, como se usan los índices y como se unen las tablas. La forma de utilizarlo es la siguiente:

Explain select * from tabla

Ahora, en lugar de ejecutar la consulta, se mostrará un listado con la información ya mencionada anteriormente. Esto es muy útil para optimizar las consultas. Más información.

2. Usar permisos poco complejos

Por defecto, el usuario que utilizamos para conectar nuestra aplicación a la Base de datos, goza todos los permisos MySQL . Sin embargo, el utilizar un usuario con sólo los permisos necesarios (para la publicación, por ejemplo), permiten a  MySQL reducir la comprobación de cada uno de los permisos, cada vez que el cliente MySQL ejecute las sentencias (INSERT, por ejemplo).

3. Hacer BENCHMARK() a nuestras expresiones

Si tenemos un problema de rendimiento con una expresión que ya hemos identificado, una excelente manera de comprobar su optimización es utilizando la función benchmark(). Su sintaxis es la siguiente:

BENCHMARK(loop_count,expression)

Esta función siempre devuelve un valor cero, pero además imprime el tiempo que se ha demorado en el cliente final (no el tiempo de CPU en el servidor). Más información .

4. Optimizar la cláusula WHERE

Estos son algunos consejos para optimizar WHERE:

• Remover los paréntesis innecesarios. Por ejemplo: DE (a<b AND b=c) AND a=5 A b>5 AND b=c AND a=5. Más información.
• COUNT(*) esta optimizado para devolver un SELECT de manera mucho más rápida, siempre y cuando sea a una tabla y sin usar WHERE. Por ejemplo: SELECT COUNT(*) FROM tabla
• La opción SQL_SMALL_RESULT , puede usarse con GROUP BY o DISTINCT para indicar que el conjunto de resultados es pequeño. En este caso, MySQL utiliza tablas temporales muy rápidas para almacenar la tabla resultante en lugar de usar ordenación.

5. Utilizar la sentencia OPTIMIZE TABLE

OPTIMIZE TABLE debe usarse si se ha eliminado gran parte de la tabla o si se han hecho varios cambios en la misma. Optimize Table desfragmenta la tabla, la repara y la ordena. Más información.

6. Evitar los tipos de columna de longitud variable

Los campos con longitud fija (CHAR, por ejemplo) son más rápidos que los de longitud variable (VARCHAR, por ejemplo). Pero, como contrapartida, ocupan más espacio en disco. Aún así, para las tablas MyISAM, se recomienda evitar el uso de las columnas de longitud variable (VARCHAR, BLOB, and TEXT).

7. Insert Delayed

Se recomienda utilizar INSERT DELAYED cuando los clientes no pueden esperar a que el INSERT se complete ó cuando no sea necesario conocer que los datos han sido escritos correctamente.

Cuando se usa INSERT DELAYED, se obtiene una confirmación inmediata por parte del servidor. La data se almacena en una cola para ser insertada cuando la tabla no esté en uso por ningún otro proceso. Además, los INSERT en cola son agrupados en bloques lo que aumenta la rapidez de su ejecución.

8. Priorizar las sentencias

Aquí explicamos dos maneras:

• Utilizar INSERT LOW_PRIORITY en los INSERT, cuando se desee priorizar las consultas SELECT sobre las INSERT. El INSERT debe esperar hasta que no hayan otros clientes leyendo la tabla.
• Utilizar SELECT HIGH_PRIORITY en los SELECT, para priorizarlos sobre cualquier otro comando que se ejecute simultáneamente, ya sea para añadir o actualizar datos en la tabla.

9. Insertar filas múltiples

Es recomendable ejecutar un insert multiple a varios inserts distintos. La sintaxis es:

INSERT INTO table (col1, col2) VALUES (‘value1′, 1), (‘value2′, 2), (‘value3′, 3)

10. Sincronizar tipos de datos

La idea es la siguiente. Si se tienen columnas que van a almacenar la misma información, pero están en distintas tablas, es aconsejable que sean del mismo tipo de datos. De esta manera, losJOINS que se ejecuten entre ellas, serán mucho más rápidos.

Tuning-Prime

Un buen script que analizará el rendimiento de MySQL es Tuning-Primer. Nos dará consejos para establecer algunas variables de la configuración, basándose en la información que proporciona el servidor.

#!/bin/sh ######################################################################### # # # MySQL performance tuning primer script # # Writen by: Matthew Montgomery <mmontgomery@mysql.com> # # Inspired by: MySQLARd (http://gert.sos.be/demo/mysqlar/) # # Version: 1.5-r5 Released: 2009-11-22 # # Licenced under GPLv2 # # # ######################################################################### ######################################################################### # # # Little known feature: 1st argument is execution mode # # # # Usage: ./tuning-primer.sh [ mode ] # # # # Available Modes: # # all : perform all checks (default) # # prompt : prompt for login credintials and socket # # and execution mode # # mem, memory : run checks for tunable options which # # effect memory usage # # disk, file : run checks for options which effect # # i/o performance or file handle limits # # innodb : run InnoDB checks /* to be improved */ # # misc : run checks for that don't categorise # # well Slow Queries, Binary logs, # # Used Connections and Worker Threads # ######################################################################### # # # Set this socket variable ONLY if you have multiple instances running # # or we are unable to find your socket, and you don't want to to be # # prompted for input each time you run this script. # # # ######################################################################### socket= export black='\033[0m' export boldblack='\033[1;0m' export red='\033[31m' export boldred='\033[1;31m' export green='\033[32m' export boldgreen='\033[1;32m' export yellow='\033[33m' export boldyellow='\033[1;33m' export blue='\033[34m' export boldblue='\033[1;34m' export magenta='\033[35m' export boldmagenta='\033[1;35m' export cyan='\033[36m' export boldcyan='\033[1;36m' export white='\033[37m' export boldwhite='\033[1;37m' cecho () ## -- Function to easliy print colored text -- ## # Color-echo. # Argument $1 = message # Argument $2 = color { local default_msg="No message passed." message=${1:-$default_msg} # Defaults to default message. #change it for fun #We use pure names color=${2:-black} # Defaults to black, if not specified. case $color in black) printf "$black" ;; boldblack) printf "$boldblack" ;; red) printf "$red" ;; boldred) printf "$boldred" ;; yellow) printf "$yellow" ;; boldyellow) printf "$boldyellow" ;; blue) printf "$blue" ;; boldblue) printf "$boldblue" ;; magenta) printf "$magenta" ;; boldmagenta) printf "$boldmagenta" ;; cyan) printf "$cyan" ;; boldcyan) printf "$boldcyan" ;; white) printf "$white" ;; boldwhite) printf "$boldwhite" ;; esac printf "%s\n" "$message" tput sgr0 # Reset to normal. printf "$black" return } cechon () ## -- Function to easliy print colored text -- ## # Color-echo. # Argument $1 = message # Argument $2 = color { local default_msg="No message passed." # Doesn't really need to be a local variable. message=${1:-$default_msg} # Defaults to default message. #change it for fun #We use pure names color=${2:-black} # Defaults to black, if not specified. case $color in black) printf "$black" ;; boldblack) printf "$boldblack" ;; red) printf "$red" ;; boldred) printf "$boldred" ;; yellow) printf "$yellow" ;; boldyellow) printf "$boldyellow" ;; blue) printf "$blue" ;; boldblue) printf "$boldblue" ;; magenta) printf "$magenta" ;; boldmagenta) printf "$boldmagenta" ;; cyan) printf "$cyan" ;; boldcyan) printf "$boldcyan" ;; white) printf "$white" ;; boldwhite) printf "$boldwhite" ;; esac printf "%s" "$message" tput sgr0 # Reset to normal. printf "$black" return } print_banner () { ## -- Banner -- ## cecho " -- MYSQL PERFORMANCE TUNING PRIMER --" boldblue cecho " - By: Matthew Montgomery -" black } ## -- Find the location of the mysql.sock file -- ## check_for_socket () { if [ -z "$socket" ] ; then # Use ~/my.cnf version if [ -f ~/.my.cnf ] ; then cnf_socket=$(grep ^socket ~/.my.cnf | awk -F \= '{ print $2 }' | head -1) fi if [ -S "$cnf_socket" ] ; then socket=$cnf_socket elif [ -S /var/lib/mysql/mysql.sock ] ; then socket=/var/lib/mysql/mysql.sock elif [ -S /var/run/mysqld/mysqld.sock ] ; then socket=/var/run/mysqld/mysqld.sock elif [ -S /tmp/mysql.sock ] ; then socket=/tmp/mysql.sock else if [ -S "$ps_socket" ] ; then socket=$ps_socket fi fi fi if [ -S "$socket" ] ; then echo UP > /dev/null else cecho "No valid socket file \"$socket\" found!" boldred cecho "The mysqld process is not running or it is installed in a custom location." red cecho "If you are sure mysqld is running, execute script in \"prompt\" mode or set " red cecho "the socket= variable at the top of this script" red exit 1 fi } check_for_plesk_passwords () { ## -- Check for the existance of plesk and login using it's credentials -- ## if [ -f /etc/psa/.psa.shadow ] ; then mysql="mysql -S $socket -u admin -p$(cat /etc/psa/.psa.shadow)" mysqladmin="mysqladmin -S $socket -u admin -p$(cat /etc/psa/.psa.shadow)" else mysql="mysql" mysqladmin="mysqladmin" # mysql="mysql -S $socket" # mysqladmin="mysqladmin -S $socket" fi } check_mysql_login () { ## -- Test for running mysql -- ## is_up=$($mysqladmin ping 2>&1) if [ "$is_up" = "mysqld is alive" ] ; then echo UP > /dev/null # echo $is_up elif [ "$is_up" != "mysqld is alive" ] ; then printf "\n" cecho "Using login values from ~/.my.cnf" cecho "- INITIAL LOGIN ATTEMPT FAILED -" boldred if [ -z $prompted ] ; then find_webmin_passwords else return 1 fi else cecho "Unknow exit status" red exit -1 fi } final_login_attempt () { is_up=$($mysqladmin ping 2>&1) if [ "$is_up" = "mysqld is alive" ] ; then echo UP > /dev/null elif [ "$is_up" != "mysqld is alive" ] ; then cecho "- FINAL LOGIN ATTEMPT FAILED -" boldred cecho "Unable to log into socket: $socket" boldred exit 1 fi } second_login_failed () { ## -- create a ~/.my.cnf and exit when all else fails -- ## cecho "Could not auto detect login info!" cecho "Found Sockets: $found_socks" cecho "Using: $socket" red read -p "Would you like to provide a different socket?: [y/N] " REPLY case $REPLY in yes | y | Y | YES) read -p "Socket: " socket ;; esac read -p "Do you have your login handy ? [y/N] : " REPLY case $REPLY in yes | y | Y | YES) answer1='yes' read -p "User: " user read -rp "Password: " pass if [ -z $pass ] ; then export mysql="$mysql -S$socket -u$user" export mysqladmin="$mysqladmin -S$socket -u$user" else export mysql="$mysql -S$socket -u$user -p$pass" export mysqladmin="$mysqladmin -S$socket -u$user -p$pass" fi ;; *) cecho "Please create a valid login to MySQL" cecho "Or, set correct values for 'user=' and 'password=' in ~/.my.cnf" ;; esac cecho " " read -p "Would you like me to create a ~/.my.cnf file for you? [y/N] : " REPLY case $REPLY in yes | y | Y | YES) answer2='yes' if [ ! -f ~/.my.cnf ] ; then umask 077 printf "[client]\nuser=$user\npassword=$pass\nsocket=$socket" > ~/.my.cnf if [ "$answer1" != 'yes' ] ; then exit 1 else final_login_attempt return 0 fi else printf "\n" cecho "~/.my.cnf already exists!" boldred printf "\n" read -p "Replace ? [y/N] : " REPLY if [ "$REPLY" = 'y' ] || [ "$REPLY" = 'Y' ] ; then printf "[client]\nuser=$user\npassword=$pass\socket=$socket" > ~/.my.cnf if [ "$answer1" != 'yes' ] ; then exit 1 else final_login_attempt return 0 fi else cecho "Please set the 'user=' and 'password=' and 'socket=' values in ~/.my.cnf" exit 1 fi fi ;; *) if [ "$answer1" != 'yes' ] ; then exit 1 else final_login_attempt return 0 fi ;; esac } find_webmin_passwords () { ## -- populate the .my.cnf file using values harvested from Webmin -- ## cecho "Testing for stored webmin passwords:" if [ -f /etc/webmin/mysql/config ] ; then user=$(grep ^login= /etc/webmin/mysql/config | cut -d "=" -f 2) pass=$(grep ^pass= /etc/webmin/mysql/config | cut -d "=" -f 2) if [ $user ] && [ $pass ] && [ ! -f ~/.my.cnf ] ; then cecho "Setting login info as User: $user Password: $pass" touch ~/.my.cnf chmod 600 ~/.my.cnf printf "[client]\nuser=$user\npassword=$pass" > ~/.my.cnf cecho "Retrying login" is_up=$($mysqladmin ping 2>&1) if [ "$is_up" = "mysqld is alive" ] ; then echo UP > /dev/null else second_login_failed fi echo else second_login_failed echo fi else cecho " None Found" boldred second_login_failed fi } ######################################################################### # # # Function to pull MySQL status variable # # # # Call using : # # mysql_status \'Mysql_status_variable\' bash_dest_variable # # # ######################################################################### mysql_status () { local status=$($mysql -Bse "show /*!50000 global */ status like $1" | awk '{ print $2 }') export "$2"=$status } ######################################################################### # # # Function to pull MySQL server runtime variable # # # # Call using : # # mysql_variable \'Mysql_server_variable\' bash_dest_variable # # - OR - # # mysql_variableTSV \'Mysql_server_variable\' bash_dest_variable # # # ######################################################################### mysql_variable () { local variable=$($mysql -Bse "show /*!50000 global */ variables like $1" | awk '{ print $2 }') export "$2"=$variable } mysql_variableTSV () { local variable=$($mysql -Bse "show /*!50000 global */ variables like $1" | awk -F \t '{ print $2 }') export "$2"=$variable } float2int () { local variable=$(echo "$1 / 1" | bc -l) export "$2"=$variable } divide () { # -- Divide two intigers -- # usage="$0 dividend divisor '$variable' scale" if [ $1 -ge 1 ] ; then dividend=$1 else cecho "Invalid Dividend" red echo $usage exit 1 fi if [ $2 -ge 1 ] ; then divisor=$2 else cecho "Invalid Divisor" red echo $usage exit 1 fi if [ ! -n $3 ] ; then cecho "Invalid variable name" red echo $usage exit 1 fi if [ -z $4 ] ; then scale=2 elif [ $4 -ge 0 ] ; then scale=$4 else cecho "Invalid scale" red echo $usage exit 1 fi export $3=$(echo "scale=$scale; $dividend / $divisor" | bc -l) } human_readable () { ######################################################################### # # # Convert a value in to human readable size and populate a variable # # with the result. # # # # Call using: # # human_readable $value 'variable name' [ places of precision] # # # ######################################################################### ## value=$1 ## variable=$2 scale=$3 if [ $1 -ge 1073741824 ] ; then if [ -z $3 ] ; then scale=2 fi divide $1 1073741824 "$2" $scale unit="G" elif [ $1 -ge 1048576 ] ; then if [ -z $3 ] ; then scale=0 fi divide $1 1048576 "$2" $scale unit="M" elif [ $1 -ge 1024 ] ; then if [ -z $3 ] ; then scale=0 fi divide $1 1024 "$2" $scale unit="K" else export "$2"=$1 unit="bytes" fi # let "$2"=$HR } human_readable_time () { ######################################################################## # # # Function to produce human readable time # # # ######################################################################## usage="$0 seconds 'variable'" if [ -z $1 ] || [ -z $2 ] ; then cecho $usage red exit 1 fi days=$(echo "scale=0 ; $1 / 86400" | bc -l) remainder=$(echo "scale=0 ; $1 % 86400" | bc -l) hours=$(echo "scale=0 ; $remainder / 3600" | bc -l) remainder=$(echo "scale=0 ; $remainder % 3600" | bc -l) minutes=$(echo "scale=0 ; $remainder / 60" | bc -l) seconds=$(echo "scale=0 ; $remainder % 60" | bc -l) export $2="$days days $hours hrs $minutes min $seconds sec" } check_mysql_version () { ## -- Print Version Info -- ## mysql_variable \'version\' mysql_version mysql_variable \'version_compile_machine\' mysql_version_compile_machine if [ "$major_version" = '3.23' ] || [ "$major_version" = '4.0' ] ; then cecho "MySQL Version $mysql_version $mysql_version_compile_machine is EOL please upgrade to MySQL 4.1 or later" boldred else cecho "MySQL Version $mysql_version $mysql_version_compile_machine" fi } post_uptime_warning () { ######################################################################### # # # Present a reminder that mysql must run for a couple of days to # # build up good numbers in server status variables before these tuning # # suggestions should be used. # # # ######################################################################### mysql_status \'Uptime\' uptime mysql_status \'Threads_connected\' threads queries_per_sec=$(($questions/$uptime)) human_readable_time $uptime uptimeHR cecho "Uptime = $uptimeHR" cecho "Avg. qps = $queries_per_sec" cecho "Total Questions = $questions" cecho "Threads Connected = $threads" echo if [ $uptime -gt 172800 ] ; then cecho "Server has been running for over 48hrs." cecho "It should be safe to follow these recommendations" else cechon "Warning: " boldred cecho "Server has not been running for at least 48hrs." boldred cecho "It may not be safe to use these recommendations" boldred fi echo "" cecho "To find out more information on how each of these" red cecho "runtime variables effects performance visit:" red if [ "$major_version" = '3.23' ] || [ "$major_version" = '4.0' ] || [ "$major_version" = '4.1' ] ; then cecho "http://dev.mysql.com/doc/refman/4.1/en/server-system-variables.html" boldblue elif [ "$major_version" = '5.0' ] || [ "$major_version" = '5.1' ] ; then cecho "http://dev.mysql.com/doc/refman/$major_version/en/server-system-variables.html" boldblue else cecho "UNSUPPORTED MYSQL VERSION" boldred exit 1 fi cecho "Visit http://www.mysql.com/products/enterprise/advisors.html" boldblue cecho "for info about MySQL's Enterprise Monitoring and Advisory Service" boldblue } check_slow_queries () { ## -- Slow Queries -- ## cecho "SLOW QUERIES" boldblue mysql_status \'Slow_queries\' slow_queries mysql_variable \'long_query_time\' long_query_time mysql_variable \'log%queries\' log_slow_queries prefered_query_time=5 if [ -e /etc/my.cnf ] ; then if [ -z $log_slow_queries ] ; then log_slow_queries=$(grep log-slow-queries /etc/my.cnf) fi fi if [ "$log_slow_queries" = 'ON' ] ; then cecho "The slow query log is enabled." elif [ "$log_slow_queries" = 'OFF' ] ; then cechon "The slow query log is " cechon "NOT" boldred cecho " enabled." elif [ -z $log_slow_queries ] ; then cechon "The slow query log is " cechon "NOT" boldred cecho " enabled." else cecho "Error: $log_slow_queries" boldred fi cecho "Current long_query_time = $long_query_time sec." cechon "You have " cechon "$slow_queries" boldred cechon " out of " cechon "$questions" boldred cecho " that take longer than $long_query_time sec. to complete" float2int long_query_time long_query_timeInt if [ $long_query_timeInt -gt $prefered_query_time ] ; then cecho "Your long_query_time may be too high, I typically set this under $prefered_query_time sec." red else cecho "Your long_query_time seems to be fine" green fi } check_binary_log () { ## -- Binary Log -- ## cecho "BINARY UPDATE LOG" boldblue mysql_variable \'log_bin\' log_bin mysql_variable \'max_binlog_size\' max_binlog_size mysql_variable \'expire_logs_days\' expire_logs_days mysql_variable \'sync_binlog\' sync_binlog # mysql_variable \'max_binlog_cache_size\' max_binlog_cache_size if [ "$log_bin" = 'ON' ] ; then cecho "The binary update log is enabled" if [ -z "$max_binlog_size" ] ; then cecho "The max_binlog_size is not set. The binary log will rotate when it reaches 1GB." red fi if [ "$expire_logs_days" -eq 0 ] ; then cecho "The expire_logs_days is not set." boldred cechon "The mysqld will retain the entire binary log until " red cecho "RESET MASTER or PURGE MASTER LOGS commands are run manually" red cecho "Setting expire_logs_days will allow you to remove old binary logs automatically" yellow cecho "See http://dev.mysql.com/doc/refman/$major_version/en/purge-master-logs.html" yellow fi if [ "$sync_binlog" = 0 ] ; then cecho "Binlog sync is not enabled, you could loose binlog records during a server crash" red fi else cechon "The binary update log is " cechon "NOT " boldred cecho "enabled." cecho "You will not be able to do point in time recovery" red cecho "See http://dev.mysql.com/doc/refman/$major_version/en/point-in-time-recovery.html" yellow fi } check_used_connections () { ## -- Used Connections -- ## mysql_variable \'max_connections\' max_connections mysql_status \'Max_used_connections\' max_used_connections mysql_status \'Threads_connected\' threads_connected connections_ratio=$(($max_used_connections*100/$max_connections)) cecho "MAX CONNECTIONS" boldblue cecho "Current max_connections = $max_connections" cecho "Current threads_connected = $threads_connected" cecho "Historic max_used_connections = $max_used_connections" cechon "The number of used connections is " if [ $connections_ratio -ge 85 ] ; then txt_color=red error=1 elif [ $connections_ratio -le 10 ] ; then txt_color=red error=2 else txt_color=green error=0 fi # cechon "$max_used_connections " $txt_color # cechon "which is " cechon "$connections_ratio% " $txt_color cecho "of the configured maximum." if [ $error -eq 1 ] ; then cecho "You should raise max_connections" $txt_color elif [ $error -eq 2 ] ; then cecho "You are using less than 10% of your configured max_connections." $txt_color cecho "Lowering max_connections could help to avoid an over-allocation of memory" $txt_color cecho "See \"MEMORY USAGE\" section to make sure you are not over-allocating" $txt_color else cecho "Your max_connections variable seems to be fine." $txt_color fi unset txt_color } check_threads() { ## -- Worker Threads -- ## cecho "WORKER THREADS" boldblue mysql_status \'Threads_created\' threads_created1 sleep 1 mysql_status \'Threads_created\' threads_created2 mysql_status \'Threads_cached\' threads_cached mysql_status \'Uptime\' uptime mysql_variable \'thread_cache_size\' thread_cache_size historic_threads_per_sec=$(($threads_created1/$uptime)) current_threads_per_sec=$(($threads_created2-$threads_created1)) cecho "Current thread_cache_size = $thread_cache_size" cecho "Current threads_cached = $threads_cached" cecho "Current threads_per_sec = $current_threads_per_sec" cecho "Historic threads_per_sec = $historic_threads_per_sec" if [ $historic_threads_per_sec -ge 2 ] && [ $threads_cached -le 1 ] ; then cecho "Threads created per/sec are overrunning threads cached" red cecho "You should raise thread_cache_size" red elif [ $current_threads_per_sec -ge 2 ] ; then cecho "Threads created per/sec are overrunning threads cached" red cecho "You should raise thread_cache_size" red else cecho "Your thread_cache_size is fine" green fi } check_key_buffer_size () { ## -- Key buffer Size -- ## cecho "KEY BUFFER" boldblue mysql_status \'Key_read_requests\' key_read_requests mysql_status \'Key_reads\' key_reads mysql_status \'Key_blocks_used\' key_blocks_used mysql_status \'Key_blocks_unused\' key_blocks_unused mysql_variable \'key_cache_block_size\' key_cache_block_size mysql_variable \'key_buffer_size\' key_buffer_size mysql_variable \'datadir\' datadir mysql_variable \'version_compile_machine\' mysql_version_compile_machine myisam_indexes=$($mysql -Bse "/*!50000 SELECT IFNULL(SUM(INDEX_LENGTH),0) from information_schema.TABLES where ENGINE='MyISAM' */") if [ -z $myisam_indexes ] ; then myisam_indexes=$(find $datadir -name '*.MYI' -exec du $duflags '{}' \; 2>&1 | awk '{ s += $1 } END { printf("%.0f\n", s )}') fi if [ $key_reads -eq 0 ] ; then cecho "No key reads?!" boldred cecho "Seriously look into using some indexes" red key_cache_miss_rate=0 key_buffer_free=$(echo "$key_blocks_unused * $key_cache_block_size / $key_buffer_size * 100" | bc -l ) key_buffer_freeRND=$(echo "scale=0; $key_buffer_free / 1" | bc -l) else key_cache_miss_rate=$(($key_read_requests/$key_reads)) if [ ! -z $key_blocks_unused ] ; then key_buffer_free=$(echo "$key_blocks_unused * $key_cache_block_size / $key_buffer_size * 100" | bc -l ) key_buffer_freeRND=$(echo "scale=0; $key_buffer_free / 1" | bc -l) else key_buffer_free='Unknown' key_buffer_freeRND=75 fi fi human_readable $myisam_indexes myisam_indexesHR cecho "Current MyISAM index space = $myisam_indexesHR $unit" human_readable $key_buffer_size key_buffer_sizeHR cecho "Current key_buffer_size = $key_buffer_sizeHR $unit" cecho "Key cache miss rate is 1 : $key_cache_miss_rate" cecho "Key buffer free ratio = $key_buffer_freeRND %" if [ "$major_version" = '5.1' ] && [ $mysql_version_num -lt '5123' ] ; then if [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.1.23 " boldred cecho "See Bug#5731, Bug#29419, Bug#29446" boldred fi fi if [ "$major_version" = '5.0' ] && [ $mysql_version_num -lt '5052' ] ; then if [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.0.52 " boldred cecho "See Bug#5731, Bug#29419, Bug#29446" boldred fi fi if [ "$major_version" = '4.1' -o "$major_version" = '4.0' ] && [ $key_buffer_size -ge 4294967296 ] && ( echo "x86_64 ppc64 ia64 sparc64 i686" | grep -q $mysql_version_compile_machine ) ; then cecho "Using key_buffer_size > 4GB will cause instability in versions prior to 5.0.52 " boldred cecho "Reduce key_buffer_size to a safe value" boldred cecho "See Bug#5731, Bug#29419, Bug#29446" boldred fi if [ $key_cache_miss_rate -le 100 ] && [ $key_cache_miss_rate -gt 0 ] && [ $key_buffer_freeRND -le 20 ]; then cecho "You could increase key_buffer_size" boldred cecho "It is safe to raise this up to 1/4 of total system memory;" cecho "assuming this is a dedicated database server." elif [ $key_buffer_freeRND -le 20 ] && [ $key_buffer_size -le $myisam_indexes ] ; then cecho "You could increase key_buffer_size" boldred cecho "It is safe to raise this up to 1/4 of total system memory;" cecho "assuming this is a dedicated database server." elif [ $key_cache_miss_rate -ge 10000 ] || [ $key_buffer_freeRND -le 50 ] ; then cecho "Your key_buffer_size seems to be too high." red cecho "Perhaps you can use these resources elsewhere" red else cecho "Your key_buffer_size seems to be fine" green fi } check_query_cache () { ## -- Query Cache -- ## cecho "QUERY CACHE" boldblue mysql_variable \'version\' mysql_version mysql_variable \'query_cache_size\' query_cache_size mysql_variable \'query_cache_limit\' query_cache_limit mysql_variable \'query_cache_min_res_unit\' query_cache_min_res_unit mysql_status \'Qcache_free_memory\' qcache_free_memory mysql_status \'Qcache_total_blocks\' qcache_total_blocks mysql_status \'Qcache_free_blocks\' qcache_free_blocks mysql_status \'Qcache_lowmem_prunes\' qcache_lowmem_prunes if [ -z $query_cache_size ] ; then cecho "You are using MySQL $mysql_version, no query cache is supported." red cecho "I recommend an upgrade to MySQL 4.1 or better" red elif [ $query_cache_size -eq 0 ] ; then cecho "Query cache is supported but not enabled" red cecho "Perhaps you should set the query_cache_size" red else qcache_used_memory=$(($query_cache_size-$qcache_free_memory)) qcache_mem_fill_ratio=$(echo "scale=2; $qcache_used_memory * 100 / $query_cache_size" | bc -l) qcache_mem_fill_ratioHR=$(echo "scale=0; $qcache_mem_fill_ratio / 1" | bc -l) cecho "Query cache is enabled" green human_readable $query_cache_size query_cache_sizeHR cecho "Current query_cache_size = $query_cache_sizeHR $unit" human_readable $qcache_used_memory qcache_used_memoryHR cecho "Current query_cache_used = $qcache_used_memoryHR $unit" human_readable $query_cache_limit query_cache_limitHR cecho "Current query_cache_limit = $query_cache_limitHR $unit" cecho "Current Query cache Memory fill ratio = $qcache_mem_fill_ratio %" if [ -z $query_cache_min_res_unit ] ; then cecho "No query_cache_min_res_unit is defined. Using MySQL < 4.1 cache fragmentation can be inpredictable" %yellow else human_readable $query_cache_min_res_unit query_cache_min_res_unitHR cecho "Current query_cache_min_res_unit = $query_cache_min_res_unitHR $unit" fi if [ $qcache_free_blocks -gt 2 ] && [ $qcache_total_blocks -gt 0 ] ; then qcache_percent_fragmented=$(echo "scale=2; $qcache_free_blocks * 100 / $qcache_total_blocks" | bc -l) qcache_percent_fragmentedHR=$(echo "scale=0; $qcache_percent_fragmented / 1" | bc -l) if [ $qcache_percent_fragmentedHR -gt 20 ] ; then cecho "Query Cache is $qcache_percent_fragmentedHR % fragmented" red cecho "Run \"FLUSH QUERY CACHE\" periodically to defragment the query cache memory" red cecho "If you have many small queries lower 'query_cache_min_res_unit' to reduce fragmentation." red fi fi if [ $qcache_mem_fill_ratioHR -le 25 ] ; then cecho "Your query_cache_size seems to be too high." red cecho "Perhaps you can use these resources elsewhere" red fi if [ $qcache_lowmem_prunes -ge 50 ] && [ $qcache_mem_fill_ratioHR -ge 80 ]; then cechon "However, " cechon "$qcache_lowmem_prunes " boldred cecho "queries have been removed from the query cache due to lack of memory" cecho "Perhaps you should raise query_cache_size" boldred fi cecho "MySQL won't cache query results that are larger than query_cache_limit in size" yellow fi } check_sort_operations () { ## -- Sort Operations -- ## cecho "SORT OPERATIONS" boldblue mysql_status \'Sort_merge_passes\' sort_merge_passes mysql_status \'Sort_scan\' sort_scan mysql_status \'Sort_range\' sort_range mysql_variable \'sort_buffer%\' sort_buffer_size mysql_variable \'read_rnd_buffer_size\' read_rnd_buffer_size total_sorts=$(($sort_scan+$sort_range)) if [ -z $read_rnd_buffer_size ] ; then mysql_variable \'record_buffer\' read_rnd_buffer_size fi ## Correct for rounding error in mysqld where 512K != 524288 ## sort_buffer_size=$(($sort_buffer_size+8)) read_rnd_buffer_size=$(($read_rnd_buffer_size+8)) human_readable $sort_buffer_size sort_buffer_sizeHR cecho "Current sort_buffer_size = $sort_buffer_sizeHR $unit" human_readable $read_rnd_buffer_size read_rnd_buffer_sizeHR cechon "Current " if [ "$major_version" = '3.23' ] ; then cechon "record_rnd_buffer " else cechon "read_rnd_buffer_size " fi cecho "= $read_rnd_buffer_sizeHR $unit" if [ $total_sorts -eq 0 ] ; then cecho "No sort operations have been performed" passes_per_sort=0 fi if [ $sort_merge_passes -ne 0 ] ; then passes_per_sort=$(($sort_merge_passes/$total_sorts)) else passes_per_sort=0 fi if [ $passes_per_sort -ge 2 ] ; then cechon "On average " cechon "$passes_per_sort " boldred cecho "sort merge passes are made per sort operation" cecho "You should raise your sort_buffer_size" cechon "You should also raise your " if [ "$major_version" = '3.23' ] ; then cecho "record_rnd_buffer_size" else cecho "read_rnd_buffer_size" fi else cecho "Sort buffer seems to be fine" green fi } check_join_operations () { ## -- Joins -- ## cecho "JOINS" boldblue mysql_status \'Select_full_join\' select_full_join mysql_status \'Select_range_check\' select_range_check mysql_variable \'join_buffer%\' join_buffer_size ## Some 4K is dropped from join_buffer_size adding it back to make sane ## ## handling of human-readable conversion ## join_buffer_size=$(($join_buffer_size+4096)) human_readable $join_buffer_size join_buffer_sizeHR 2 cecho "Current join_buffer_size = $join_buffer_sizeHR $unit" cecho "You have had $select_full_join queries where a join could not use an index properly" if [ $select_range_check -eq 0 ] && [ $select_full_join -eq 0 ] ; then cecho "Your joins seem to be using indexes properly" green fi if [ $select_full_join -gt 0 ] ; then print_error='true' raise_buffer='true' fi if [ $select_range_check -gt 0 ] ; then cecho "You have had $select_range_check joins without keys that check for key usage after each row" red print_error='true' raise_buffer='true' fi ## For Debuging ## # print_error='true' if [ $join_buffer_size -ge 4194304 ] ; then cecho "join_buffer_size >= 4 M" boldred cecho "This is not advised" boldred raise_buffer= fi if [ $print_error ] ; then if [ "$major_version" = '3.23' ] || [ "$major_version" = '4.0' ] ; then cecho "You should enable \"log-long-format\" " elif [ "$major_version" = '4.1' ] || [ "$major_version" = '5.0' ] || [ "$major_version" = '5.1' ] ; then cecho "You should enable \"log-queries-not-using-indexes\"" fi cecho "Then look for non indexed joins in the slow query log." if [ $raise_buffer ] ; then cecho "If you are unable to optimize your queries you may want to increase your" cecho "join_buffer_size to accommodate larger joins in one pass." printf "\n" cecho "Note! This script will still suggest raising the join_buffer_size when" boldred cecho "ANY joins not using indexes are found." boldred fi fi # XXX Add better tests for join_buffer_size XXX # } check_tmp_tables () { ## -- Temp Tables -- ## cecho "TEMP TABLES" boldblue mysql_status \'Created_tmp_tables\' created_tmp_tables mysql_status \'Created_tmp_disk_tables\' created_tmp_disk_tables mysql_variable \'tmp_table_size\' tmp_table_size mysql_variable \'max_heap_table_size\' max_heap_table_size if [ $created_tmp_tables -eq 0 ] ; then tmp_disk_tables=0 else tmp_disk_tables=$((created_tmp_disk_tables*100/(created_tmp_tables+created_tmp_disk_tables))) fi human_readable $max_heap_table_size max_heap_table_sizeHR cecho "Current max_heap_table_size = $max_heap_table_sizeHR $unit" human_readable $tmp_table_size tmp_table_sizeHR cecho "Current tmp_table_size = $tmp_table_sizeHR $unit" cecho "Of $created_tmp_tables temp tables, $tmp_disk_tables% were created on disk" if [ $tmp_table_size -gt $max_heap_table_size ] ; then cecho "Effective in-memory tmp_table_size is limited to max_heap_table_size." yellow fi if [ $tmp_disk_tables -ge 25 ] ; then cecho "Perhaps you should increase your tmp_table_size and/or max_heap_table_size" boldred cecho "to reduce the number of disk-based temporary tables" boldred cecho "Note! BLOB and TEXT columns are not allow in memory tables." yellow cecho "If you are using these columns raising these values might not impact your " yellow cecho "ratio of on disk temp tables." yellow else cecho "Created disk tmp tables ratio seems fine" green fi } check_open_files () { ## -- Open Files Limit -- ## cecho "OPEN FILES LIMIT" boldblue mysql_variable \'open_files_limit\' open_files_limit mysql_status \'Open_files\' open_files if [ -z $open_files_limit ] || [ $open_files_limit -eq 0 ] ; then open_files_limit=$(ulimit -n) cant_override=1 else cant_override=0 fi cecho "Current open_files_limit = $open_files_limit files" open_files_ratio=$(($open_files*100/$open_files_limit)) cecho "The open_files_limit should typically be set to at least 2x-3x" yellow cecho "that of table_cache if you have heavy MyISAM usage." yellow if [ $open_files_ratio -ge 75 ] ; then cecho "You currently have open more than 75% of your open_files_limit" boldred if [ $cant_override -eq 1 ] ; then cecho "You should set a higer value for ulimit -u in the mysql startup script then restart mysqld" boldred cecho "MySQL 3.23 users : This is just a guess based upon the current shell's ulimit -u value" yellow elif [ $cant_override -eq 0 ] ; then cecho "You should set a higher value for open_files_limit in my.cnf" boldred else cecho "ERROR can't determine if mysqld override of ulimit is allowed" boldred exit 1 fi else cecho "Your open_files_limit value seems to be fine" green fi } check_table_cache () { ## -- Table Cache -- ## cecho "TABLE CACHE" boldblue mysql_variable \'datadir\' datadir mysql_variable \'table_cache\' table_cache ## /* MySQL +5.1 version of table_cache */ ## mysql_variable \'table_open_cache\' table_open_cache mysql_variable \'table_definition_cache\' table_definition_cache mysql_status \'Open_tables\' open_tables mysql_status \'Opened_tables\' opened_tables mysql_status \'Open_table_definitions\' open_table_definitions table_count=$($mysql -Bse "/*!50000 SELECT COUNT(*) FROM INFORMATION_SCHEMA.TABLES WHERE TABLE_TYPE='BASE TABLE' */") if [ -z "$table_count" ] ; then if [ "$UID" != "$socket_owner" ] && [ "$UID" != "0" ] ; then cecho "You are not '$socket_owner' or 'root'" red cecho "I am unable to determine the table_count!" red else table_count=$(find $datadir 2>&1 | grep -c .frm$) fi fi if [ $table_open_cache ] ; then table_cache=$table_open_cache fi if [ $opened_tables -ne 0 ] && [ $table_cache -ne 0 ] ; then table_cache_hit_rate=$(($open_tables*100/$opened_tables)) table_cache_fill=$(($open_tables*100/$table_cache)) elif [ $opened_tables -eq 0 ] && [ $table_cache -ne 0 ] ; then table_cache_hit_rate=100 table_cache_fill=$(($open_tables*100/$table_cache)) else cecho "ERROR no table_cache ?!" boldred exit 1 fi if [ $table_cache ] && [ ! $table_open_cache ] ; then cecho "Current table_cache value = $table_cache tables" fi if [ $table_open_cache ] ; then cecho "Current table_open_cache = $table_open_cache tables" cecho "Current table_definition_cache = $table_definition_cache tables" fi if [ $table_count ] ; then cecho "You have a total of $table_count tables" fi if [ $table_cache_fill -lt 95 ] ; then cechon "You have " cechon "$open_tables " green cecho "open tables." cecho "The table_cache value seems to be fine" green elif [ $table_cache_hit_rate -le 85 -o $table_cache_fill -ge 95 ]; then cechon "You have " cechon "$open_tables " boldred cecho "open tables." cechon "Current table_cache hit rate is " cecho "$table_cache_hit_rate%" boldred cechon ", while " cechon "$table_cache_fill% " boldred cecho "of your table cache is in use" cecho "You should probably increase your table_cache" red else cechon "Current table_cache hit rate is " cechon "$table_cache_hit_rate%" green cechon ", while " cechon "$table_cache_fill% " green cecho "of your table cache is in use" cecho "The table cache value seems to be fine" green fi if [ $table_definition_cache ] && [ $table_definition_cache -le $table_count ] && [ $table_count -ge 100 ] ; then cecho "You should probably increase your table_definition_cache value." red fi } check_table_locking () { ## -- Table Locking -- ## cecho "TABLE LOCKING" boldblue mysql_status \'Table_locks_waited\' table_locks_waited mysql_status \'Table_locks_immediate\' table_locks_immediate mysql_variable \'concurrent_insert\' concurrent_insert mysql_variable \'low_priority_updates\' low_priority_updates if [ "$concurrent_insert" = 'ON' ]; then concurrent_insert=1 elif [ "$concurrent_insert" = 'OFF' ]; then concurrent_insert=0 fi cechon "Current Lock Wait ratio = " if [ $table_locks_waited -gt 0 ]; then immediate_locks_miss_rate=$(($table_locks_immediate/$table_locks_waited)) cecho "1 : $immediate_locks_miss_rate" red else immediate_locks_miss_rate=99999 # perfect cecho "0 : $questions" fi if [ $immediate_locks_miss_rate -lt 5000 ] ; then cecho "You may benefit from selective use of InnoDB." if [ "$low_priority_updates" = 'OFF' ] ; then cecho "If you have long running SELECT's against MyISAM tables and perform" cecho "frequent updates consider setting 'low_priority_updates=1'" fi if [ $concurrent_insert -le 1 ] && [ "$major_version" = '5.0' -o "$major_version" = '5.1' ] ; then cecho "If you have a high concurrency of inserts on Dynamic row-length tables" cecho "consider setting 'concurrent_insert=2'." fi else cecho "Your table locking seems to be fine" green fi } check_table_scans () { ## -- Table Scans -- ## cecho "TABLE SCANS" boldblue mysql_status \'Com_select\' com_select mysql_status \'Handler_read_rnd_next\' read_rnd_next mysql_variable \'read_buffer_size\' read_buffer_size if [ -z $read_buffer_size ] ; then mysql_variable \'record_buffer\' read_buffer_size fi human_readable $read_buffer_size read_buffer_sizeHR cecho "Current read_buffer_size = $read_buffer_sizeHR $unit" if [ $com_select -gt 0 ] ; then full_table_scans=$(($read_rnd_next/$com_select)) cecho "Current table scan ratio = $full_table_scans : 1" if [ $full_table_scans -ge 4000 ] && [ $read_buffer_size -le 2097152 ] ; then cecho "You have a high ratio of sequential access requests to SELECTs" red cechon "You may benefit from raising " red if [ "$major_version" = '3.23' ] ; then cechon "record_buffer " red else cechon "read_buffer_size " red fi cecho "and/or improving your use of indexes." red elif [ $read_buffer_size -gt 8388608 ] ; then cechon "read_buffer_size is over 8 MB " red cecho "there is probably no need for such a large read_buffer" red else cecho "read_buffer_size seems to be fine" green fi else cecho "read_buffer_size seems to be fine" green fi } check_innodb_status () { ## -- InnoDB -- ## mysql_variable \'have_innodb\' have_innodb if [ "$have_innodb" = "YES" ] ; then mysql_variable \'innodb_buffer_pool_size\' innodb_buffer_pool_size mysql_variable \'innodb_additional_mem_pool_size\' innodb_additional_mem_pool_size mysql_variable \'innodb_fast_shutdown\' innodb_fast_shutdown mysql_variable \'innodb_flush_log_at_trx_commit\' innodb_flush_log_at_trx_commit mysql_variable \'innodb_locks_unsafe_for_binlog\' innodb_locks_unsafe_for_binlog mysql_variable \'innodb_log_buffer_size\' innodb_log_buffer_size mysql_variable \'innodb_log_file_size\' innodb_log_file_size mysql_variable \'innodb_log_files_in_group\' innodb_log_files_in_group mysql_variable \'innodb_safe_binlog\' innodb_safe_binlog mysql_variable \'innodb_thread_concurrency\' innodb_thread_concurrency cecho "INNODB STATUS" boldblue innodb_indexes=$($mysql -Bse "/*!50000 SELECT IFNULL(SUM(INDEX_LENGTH),0) from information_schema.TABLES where ENGINE='InnoDB' */") innodb_data=$($mysql -Bse "/*!50000 SELECT IFNULL(SUM(DATA_LENGTH),0) from information_schema.TABLES where ENGINE='InnoDB' */") if [ ! -z "$innodb_indexes" ] ; then mysql_status \'Innodb_buffer_pool_pages_data\' innodb_buffer_pool_pages_data mysql_status \'Innodb_buffer_pool_pages_misc\' innodb_buffer_pool_pages_misc mysql_status \'Innodb_buffer_pool_pages_free\' innodb_buffer_pool_pages_free mysql_status \'Innodb_buffer_pool_pages_total\' innodb_buffer_pool_pages_total mysql_status \'Innodb_buffer_pool_read_ahead_seq\' innodb_buffer_pool_read_ahead_seq mysql_status \'Innodb_buffer_pool_read_requests\' innodb_buffer_pool_read_requests mysql_status \'Innodb_os_log_pending_fsyncs\' innodb_os_log_pending_fsyncs mysql_status \'Innodb_os_log_pending_writes\' innodb_os_log_pending_writes mysql_status \'Innodb_log_waits\' innodb_log_waits mysql_status \'Innodb_row_lock_time\' innodb_row_lock_time mysql_status \'Innodb_row_lock_waits\' innodb_row_lock_waits human_readable $innodb_indexes innodb_indexesHR cecho "Current InnoDB index space = $innodb_indexesHR $unit" human_readable $innodb_data innodb_dataHR cecho "Current InnoDB data space = $innodb_dataHR $unit" percent_innodb_buffer_pool_free=$(($innodb_buffer_pool_pages_free*100/$innodb_buffer_pool_pages_total)) cecho "Current InnoDB buffer pool free = "$percent_innodb_buffer_pool_free" %" else cecho "Cannot parse InnoDB stats prior to 5.0.x" red $mysql -s -e "SHOW /*!50000 ENGINE */ INNODB STATUS\G" fi human_readable $innodb_buffer_pool_size innodb_buffer_pool_sizeHR cecho "Current innodb_buffer_pool_size = $innodb_buffer_pool_sizeHR $unit" cecho "Depending on how much space your innodb indexes take up it may be safe" cecho "to increase this value to up to 2 / 3 of total system memory" else cecho "No InnoDB Support Enabled!" boldred fi } total_memory_used () { ## -- Total Memory Usage -- ## cecho "MEMORY USAGE" boldblue mysql_variable \'read_buffer_size\' read_buffer_size mysql_variable \'read_rnd_buffer_size\' read_rnd_buffer_size mysql_variable \'sort_buffer_size\' sort_buffer_size mysql_variable \'thread_stack\' thread_stack mysql_variable \'max_connections\' max_connections mysql_variable \'join_buffer_size\' join_buffer_size mysql_variable \'tmp_table_size\' tmp_table_size mysql_variable \'max_heap_table_size\' max_heap_table_size mysql_variable \'log_bin\' log_bin mysql_status \'Max_used_connections\' max_used_connections if [ "$major_version" = "3.23" ] ; then mysql_variable \'record_buffer\' read_buffer_size mysql_variable \'record_rnd_buffer\' read_rnd_buffer_size mysql_variable \'sort_buffer\' sort_buffer_size fi if [ "$log_bin" = "ON" ] ; then mysql_variable \'binlog_cache_size\' binlog_cache_size else binlog_cache_size=0 fi if [ $max_heap_table_size -le $tmp_table_size ] ; then effective_tmp_table_size=$max_heap_table_size else effective_tmp_table_size=$tmp_table_size fi per_thread_buffers=$(echo "($read_buffer_size+$read_rnd_buffer_size+$sort_buffer_size+$thread_stack+$join_buffer_size+$binlog_cache_size)*$max_connections" | bc -l) per_thread_max_buffers=$(echo "($read_buffer_size+$read_rnd_buffer_size+$sort_buffer_size+$thread_stack+$join_buffer_size+$binlog_cache_size)*$max_used_connections" | bc -l) mysql_variable \'innodb_buffer_pool_size\' innodb_buffer_pool_size if [ -z $innodb_buffer_pool_size ] ; then innodb_buffer_pool_size=0 fi mysql_variable \'innodb_additional_mem_pool_size\' innodb_additional_mem_pool_size if [ -z $innodb_additional_mem_pool_size ] ; then innodb_additional_mem_pool_size=0 fi mysql_variable \'innodb_log_buffer_size\' innodb_log_buffer_size if [ -z $innodb_log_buffer_size ] ; then innodb_log_buffer_size=0 fi mysql_variable \'key_buffer_size\' key_buffer_size mysql_variable \'query_cache_size\' query_cache_size if [ -z $query_cache_size ] ; then query_cache_size=0 fi global_buffers=$(echo "$innodb_buffer_pool_size+$innodb_additional_mem_pool_size+$innodb_log_buffer_size+$key_buffer_size+$query_cache_size" | bc -l) max_memory=$(echo "$global_buffers+$per_thread_max_buffers" | bc -l) total_memory=$(echo "$global_buffers+$per_thread_buffers" | bc -l) pct_of_sys_mem=$(echo "scale=0; $total_memory*100/$physical_memory" | bc -l) if [ $pct_of_sys_mem -gt 90 ] ; then txt_color=boldred error=1 else txt_color= error=0 fi human_readable $max_memory max_memoryHR cecho "Max Memory Ever Allocated : $max_memoryHR $unit" $txt_color human_readable $per_thread_buffers per_thread_buffersHR cecho "Configured Max Per-thread Buffers : $per_thread_buffersHR $unit" $txt_color human_readable $global_buffers global_buffersHR cecho "Configured Max Global Buffers : $global_buffersHR $unit" $txt_color human_readable $total_memory total_memoryHR cecho "Configured Max Memory Limit : $total_memoryHR $unit" $txt_color # human_readable $effective_tmp_table_size effective_tmp_table_sizeHR # cecho "Plus $effective_tmp_table_sizeHR $unit per temporary table created" human_readable $physical_memory physical_memoryHR cecho "Physical Memory : $physical_memoryHR $unit" $txt_color if [ $error -eq 1 ] ; then printf "\n" cecho "nMax memory limit exceeds 90% of physical memory" $txt_color else cecho "Max memory limit seem to be within acceptable norms" green fi unset txt_color } ## Required Functions ## login_validation () { check_for_socket # determine the socket location -- 1st login check_for_plesk_passwords # determine the login method -- 2nd login check_mysql_login # determine if mysql is accepting login -- 3rd login export major_version=$($mysql -Bse "SELECT SUBSTRING_INDEX(VERSION(), '.', +2)") export mysql_version_num=$($mysql -Bse "SELECT LEFT(REPLACE(SUBSTRING_INDEX(VERSION(), '-', +1), '.', ''),4)" ) } shared_info () { export major_version=$($mysql -Bse "SELECT SUBSTRING_INDEX(VERSION(), '.', +2)") export mysql_version_num=$($mysql -Bse "SELECT LEFT(REPLACE(SUBSTRING_INDEX(VERSION(), '-', +1), '.', ''),4)" ) mysql_status \'Questions\' questions # socket_owner=$(find -L $socket -printf '%u\n') socket_owner=$(ls -nH $socket | awk '{ print $3 }') } get_system_info () { export OS=$(uname) # Get information for various UNIXes if [ "$OS" = 'Darwin' ]; then ps_socket=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }' | head -1) found_socks=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }') export physical_memory=$(sysctl -n hw.memsize) export duflags='' elif [ "$OS" = 'FreeBSD' ] || [ "$OS" = 'OpenBSD' ]; then ## On FreeBSD must be root to locate sockets. ps_socket=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }' | head -1) found_socks=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }') export physical_memory=$(sysctl -n hw.realmem) export duflags='' elif [ "$OS" = 'Linux' ] ; then ## Includes SWAP ## export physical_memory=$(free -b | grep -v buffers | awk '{ s += $2 } END { printf("%.0f\n", s ) }') ps_socket=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }' | head -1) found_socks=$(netstat -ln | awk '/mysql(d)?\.sock/ { print $9 }') export physical_memory=$(awk '/^MemTotal/ { printf("%.0f", $2*1024 ) }' < /proc/meminfo) export duflags='-b' elif [ "$OS" = 'SunOS' ] ; then ps_socket=$(netstat -a | awk '/mysql(d)?.sock/ { print $5 }' | head -1) found_socks=$(netstat -a | awk '/mysql(d)?.sock/ { print $5 }') export physical_memory=$(prtconf | awk '/^Memory\ size:/ { print $3*1048576 }') fi } ## Optional Components Groups ## banner_info () { shared_info print_banner ; echo check_mysql_version ; echo post_uptime_warning ; echo } misc () { shared_info check_slow_queries ; echo check_binary_log ; echo check_threads ; echo check_used_connections ; echo check_innodb_status ; echo } memory () { shared_info total_memory_used ; echo check_key_buffer_size ; echo check_query_cache ; echo check_sort_operations ; echo check_join_operations ; echo } file () { shared_info check_open_files ; echo check_table_cache ; echo check_tmp_tables ; echo check_table_scans ; echo check_table_locking ; echo } all () { banner_info misc memory file } prompt () { prompted='true' read -p "Username [anonymous] : " user read -rp "Password [<none>] : " pass cecho " " read -p "Socket [ /var/lib/mysql/mysql.sock ] : " socket if [ -z $socket ] ; then export socket='/var/lib/mysql/mysql.sock' fi if [ -z $pass ] ; then export mysql="mysql -S $socket -u$user" export mysqladmin="mysqladmin -S $socket -u$user" else export mysql="mysql -S $socket -u$user -p$pass" export mysqladmin="mysqladmin -S $socket -u$user -p$pass" fi check_for_socket check_mysql_login if [ $? = 1 ] ; then exit 1 fi read -p "Mode to test - banner, file, misc, mem, innodb, [all] : " REPLY if [ -z $REPLY ] ; then REPLY='all' fi case $REPLY in banner | BANNER | header | HEADER | head | HEAD) banner_info ;; misc | MISC | miscelaneous ) misc ;; mem | memory | MEM | MEMORY ) memory ;; file | FILE | disk | DISK ) file ;; innodb | INNODB ) innodb ;; all | ALL ) cecho " " all ;; * ) cecho "Invalid Mode! Valid options are 'banner', 'misc', 'memory', 'file', 'innodb' or 'all'" boldred exit 1 ;; esac } ## Address environmental differences ## get_system_info # echo $ps_socket if [ -z "$1" ] ; then login_validation mode='ALL' elif [ "$1" = "prompt" ] || [ "$1" = "PROMPT" ] ; then mode=$1 elif [ "$1" != "prompt" ] || [ "$1" != "PROMPT" ] ; then login_validation mode=$1 fi case $mode in all | ALL ) cecho " " all ;; mem | memory | MEM | MEMORY ) cecho " " memory ;; file | FILE | disk | DISK ) cecho " " file ;; banner | BANNER | header | HEADER | head | HEAD ) banner_info ;; misc | MISC | miscelaneous ) cecho " " misc ;; innodb | INNODB ) banner_info check_innodb_status ; echo ;; prompt | PROMPT ) prompt ;; *) cecho "usage: $0 [ all | banner | file | innodb | memory | misc | prompt ]" boldred exit 1 ;; esac

.

MySQLTuner

#!/usr/bin/perl -w # mysqltuner.pl - Version 1.1.0 # High Performance MySQL Tuning Script # Copyright (C) 2006-2009 Major Hayden - major@mhtx.net # # For the latest updates, please visit http://mysqltuner.com/ # Subversion repository available at http://tools.assembla.com/svn/mysqltuner/ # # This program is free software: you can redistribute it and/or modify # it under the terms of the GNU General Public License as published by # the Free Software Foundation, either version 3 of the License, or # (at your option) any later version. # # This program is distributed in the hope that it will be useful, # but WITHOUT ANY WARRANTY; without even the implied warranty of # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the # GNU General Public License for more details. # # You should have received a copy of the GNU General Public License # along with this program. If not, see <http://www.gnu.org/licenses/>. # # This project would not be possible without help from: # Matthew Montgomery Paul Kehrer # Dave Burgess Jonathan Hinds # Mike Jackson Nils Breunese # Shawn Ashlee Luuk Vosslamber # Ville Skytta Trent Hornibrook # Jason Gill Mark Imbriaco # Greg Eden Aubin Galinotti # Giovanni Bechis Bill Bradford # Ryan Novosielski Michael Scheidell # Blair Christensen Hans du Plooy # Victor Trac Everett Barnes # Tom Krouper Gary Barrueto # Simon Greenaway Adam Stein # # Inspired by Matthew Montgomery's tuning-primer.sh script: # http://forge.mysql.com/projects/view.php?id=44 # use strict; use warnings; use diagnostics; use Getopt::Long; # Set up a few variables for use in the script my $tunerversion = "1.0.1"; my (@adjvars, @generalrec); # Set defaults my %opt = ( "nobad" => 0, "nogood" => 0, "noinfo" => 0, "nocolor" => 0, "forcemem" => 0, "forceswap" => 0, "host" => 0, "socket" => 0, "port" => 0, "user" => 0, "pass" => 0, "skipsize" => 0, "checkversion" => 0, ); # Gather the options from the command line GetOptions(\%opt, 'nobad', 'nogood', 'noinfo', 'nocolor', 'forcemem=i', 'forceswap=i', 'host=s', 'socket=s', 'port=i', 'user=s', 'pass=s', 'skipsize', 'checkversion', 'help', ); if (defined $opt{'help'} && $opt{'help'} == 1) { usage(); } sub usage { # Shown with --help option passed print "\n". " MySQLTuner $tunerversion - MySQL High Performance Tuning Script\n". " Bug reports, feature requests, and downloads at http://mysqltuner.com/\n". " Maintained by Major Hayden (major\@mhtx.net) - Licensed under GPL\n". "\n". " Important Usage Guidelines:\n". " To run the script with the default options, run the script without arguments\n". " Allow MySQL server to run for at least 24-48 hours before trusting suggestions\n". " Some routines may require root level privileges (script will provide warnings)\n". " You must provide the remote server's total memory when connecting to other servers\n". "\n". " Connection and Authentication\n". " --host <hostname> Connect to a remote host to perform tests (default: localhost)\n". " --socket <socket> Use a different socket for a local connection\n". " --port <port> Port to use for connection (default: 3306)\n". " --user <username> Username to use for authentication\n". " --pass <password> Password to use for authentication\n". "\n". " Performance and Reporting Options\n". " --skipsize Don't enumerate tables and their types/sizes (default: on)\n". " (Recommended for servers with many tables)\n". " --checkversion Check for updates to MySQLTuner (default: don't check)\n". " --forcemem <size> Amount of RAM installed in megabytes\n". " --forceswap <size> Amount of swap memory configured in megabytes\n". "\n". " Output Options:\n". " --nogood Remove OK responses\n". " --nobad Remove negative/suggestion responses\n". " --noinfo Remove informational responses\n". " --nocolor Don't print output in color\n". "\n"; exit; } # Setting up the colors for the print styles my $good = ($opt{nocolor} == 0)? "[\e[0;32mOK\e[0m]" : "[OK]" ; my $bad = ($opt{nocolor} == 0)? "[\e[0;31m!!\e[0m]" : "[!!]" ; my $info = ($opt{nocolor} == 0)? "[\e[0;34m--\e[0m]" : "[--]" ; # Functions that handle the print styles sub goodprint { print $good." ".$_[0] unless ($opt{nogood} == 1); } sub infoprint { print $info." ".$_[0] unless ($opt{noinfo} == 1); } sub badprint { print $bad." ".$_[0] unless ($opt{nobad} == 1); } sub redwrap { return ($opt{nocolor} == 0)? "\e[0;31m".$_[0]."\e[0m" : $_[0] ; } sub greenwrap { return ($opt{nocolor} == 0)? "\e[0;32m".$_[0]."\e[0m" : $_[0] ; } # Calculates the parameter passed in bytes, and then rounds it to one decimal place sub hr_bytes { my $num = shift; if ($num >= (1024**3)) { #GB return sprintf("%.1f",($num/(1024**3)))."G"; } elsif ($num >= (1024**2)) { #MB return sprintf("%.1f",($num/(1024**2)))."M"; } elsif ($num >= 1024) { #KB return sprintf("%.1f",($num/1024))."K"; } else { return $num."B"; } } # Calculates the parameter passed in bytes, and then rounds it to the nearest integer sub hr_bytes_rnd { my $num = shift; if ($num >= (1024**3)) { #GB return int(($num/(1024**3)))."G"; } elsif ($num >= (1024**2)) { #MB return int(($num/(1024**2)))."M"; } elsif ($num >= 1024) { #KB return int(($num/1024))."K"; } else { return $num."B"; } } # Calculates the parameter passed to the nearest power of 1000, then rounds it to the nearest integer sub hr_num { my $num = shift; if ($num >= (1000**3)) { # Billions return int(($num/(1000**3)))."B"; } elsif ($num >= (1000**2)) { # Millions return int(($num/(1000**2)))."M"; } elsif ($num >= 1000) { # Thousands return int(($num/1000))."K"; } else { return $num; } } # Calculates uptime to display in a more attractive form sub pretty_uptime { my $uptime = shift; my $seconds = $uptime % 60; my $minutes = int(($uptime % 3600) / 60); my $hours = int(($uptime % 86400) / (3600)); my $days = int($uptime / (86400)); my $uptimestring; if ($days > 0) { $uptimestring = "${days}d ${hours}h ${minutes}m ${seconds}s"; } elsif ($hours > 0) { $uptimestring = "${hours}h ${minutes}m ${seconds}s"; } elsif ($minutes > 0) { $uptimestring = "${minutes}m ${seconds}s"; } else { $uptimestring = "${seconds}s"; } return $uptimestring; } # Retrieves the memory installed on this machine my ($physical_memory,$swap_memory,$duflags); sub os_setup { sub memerror { badprint "Unable to determine total memory/swap; use '--forcemem' and '--forceswap'\n"; exit; } my $os = `uname`; $duflags = ($os =~ /Linux/) ? '-b' : ''; if ($opt{'forcemem'} > 0) { $physical_memory = $opt{'forcemem'} * 1048576; infoprint "Assuming $opt{'forcemem'} MB of physical memory\n"; if ($opt{'forceswap'} > 0) { $swap_memory = $opt{'forceswap'} * 1048576; infoprint "Assuming $opt{'forceswap'} MB of swap space\n"; } else { $swap_memory = 0; badprint "Assuming 0 MB of swap space (use --forceswap to specify)\n"; } } else { if ($os =~ /Linux/) { $physical_memory = `free -b | grep Mem | awk '{print \$2}'` or memerror; $swap_memory = `free -b | grep Swap | awk '{print \$2}'` or memerror; } elsif ($os =~ /Darwin/) { $physical_memory = `sysctl -n hw.memsize` or memerror; $swap_memory = `sysctl -n vm.swapusage | awk '{print \$3}' | sed 's/\..*\$//'` or memerror; } elsif ($os =~ /NetBSD|OpenBSD/) { $physical_memory = `sysctl -n hw.physmem` or memerror; if ($physical_memory < 0) { $physical_memory = `sysctl -n hw.physmem64` or memerror; } $swap_memory = `swapctl -l | grep '^/' | awk '{ s+= \$2 } END { print s }'` or memerror; } elsif ($os =~ /BSD/) { $physical_memory = `sysctl -n hw.realmem`; $swap_memory = `swapinfo | grep '^/' | awk '{ s+= \$2 } END { print s }'`; } elsif ($os =~ /SunOS/) { $physical_memory = `/usr/sbin/prtconf | grep Memory | cut -f 3 -d ' '` or memerror; chomp($physical_memory); $physical_memory = $physical_memory*1024*1024; } } chomp($physical_memory); } # Checks to see if a MySQL login is possible my ($mysqllogin,$doremote,$remotestring); sub mysql_setup { $doremote = 0; $remotestring = ''; my $command = `which mysqladmin`; chomp($command); if (! -e $command) { badprint "Unable to find mysqladmin in your \$PATH. Is MySQL installed?\n"; exit; } # Are we being asked to connect via a socket? if ($opt{socket} ne 0) { $remotestring = " -S $opt{socket}"; } # Are we being asked to connect to a remote server? if ($opt{host} ne 0) { chomp($opt{host}); $opt{port} = ($opt{port} eq 0)? 3306 : $opt{port} ; # If we're doing a remote connection, but forcemem wasn't specified, we need to exit if ($opt{'forcemem'} eq 0) { badprint "The --forcemem option is required for remote connections\n"; exit; } infoprint "Performing tests on $opt{host}:$opt{port}\n"; $remotestring = " -h $opt{host} -P $opt{port}"; $doremote = 1; } # Did we already get a username and password passed on the command line? if ($opt{user} ne 0 and $opt{pass} ne 0) { $mysqllogin = "-u $opt{user} -p'$opt{pass}'".$remotestring; my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`; if ($loginstatus =~ /mysqld is alive/) { goodprint "Logged in using credentials passed on the command line\n"; return 1; } else { badprint "Attempted to use login credentials, but they were invalid\n"; exit 0; } } if ( -r "/etc/psa/.psa.shadow" and $doremote == 0 ) { # It's a Plesk box, use the available credentials $mysqllogin = "-u admin -p`cat /etc/psa/.psa.shadow`"; my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`; unless ($loginstatus =~ /mysqld is alive/) { badprint "Attempted to use login credentials from Plesk, but they failed.\n"; exit 0; } } else { # It's not Plesk, we should try a login my $loginstatus = `mysqladmin $remotestring ping 2>&1`; if ($loginstatus =~ /mysqld is alive/) { # Login went just fine $mysqllogin = " $remotestring "; # Did this go well because of a .my.cnf file or is there no password set? my $userpath = `printenv HOME`; if (length($userpath) > 0) { chomp($userpath); } unless ( -e "${userpath}/.my.cnf" ) { badprint "Successfully authenticated with no password - SECURITY RISK!\n"; } return 1; } else { print STDERR "Please enter your MySQL administrative login: "; my $name = <>; print STDERR "Please enter your MySQL administrative password: "; system("stty -echo"); my $password = <>; system("stty echo"); chomp($password); chomp($name); $mysqllogin = "-u $name"; if (length($password) > 0) { $mysqllogin .= " -p'$password'"; } $mysqllogin .= $remotestring; my $loginstatus = `mysqladmin ping $mysqllogin 2>&1`; if ($loginstatus =~ /mysqld is alive/) { print STDERR "\n"; if (! length($password)) { # Did this go well because of a .my.cnf file or is there no password set? my $userpath = `ls -d ~`; chomp($userpath); unless ( -e "$userpath/.my.cnf" ) { badprint "Successfully authenticated with no password - SECURITY RISK!\n"; } } return 1; } else { print "\n".$bad." Attempted to use login credentials, but they were invalid.\n"; exit 0; } exit 0; } } } # Populates all of the variable and status hashes my (%mystat,%myvar,$dummyselect); sub get_all_vars { # We need to initiate at least one query so that our data is useable $dummyselect = `mysql $mysqllogin -Bse "SELECT VERSION();"`; my @mysqlvarlist = `mysql $mysqllogin -Bse "SHOW /*!50000 GLOBAL */ VARIABLES;"`; foreach my $line (@mysqlvarlist) { $line =~ /([a-zA-Z_]*)\s*(.*)/; $myvar{$1} = $2; } my @mysqlstatlist = `mysql $mysqllogin -Bse "SHOW /*!50000 GLOBAL */ STATUS;"`; foreach my $line (@mysqlstatlist) { $line =~ /([a-zA-Z_]*)\s*(.*)/; $mystat{$1} = $2; } } # Checks for updates to MySQLTuner sub validate_tuner_version { print "\n-------- General Statistics --------------------------------------------------\n"; if ($opt{checkversion} eq 0) { infoprint "Skipped version check for MySQLTuner script\n"; return; } my $update; my $url = "http://mysqltuner.com/versioncheck.php?v=$tunerversion"; if (-e "/usr/bin/curl") { $update = `/usr/bin/curl --connect-timeout 5 '$url' 2>/dev/null`; chomp($update); } elsif (-e "/usr/bin/wget") { $update = `/usr/bin/wget -e timestamping=off -T 5 -O - '$url' 2>/dev/null`; chomp($update); } if ($update eq 1) { badprint "There is a new version of MySQLTuner available\n"; } elsif ($update eq 0) { goodprint "You have the latest version of MySQLTuner\n"; } else { infoprint "Unable to check for the latest MySQLTuner version\n"; } } # Checks for supported or EOL'ed MySQL versions my ($mysqlvermajor,$mysqlverminor); sub validate_mysql_version { ($mysqlvermajor,$mysqlverminor) = $myvar{'version'} =~ /(\d)\.(\d)/; if ($mysqlvermajor < 5) { badprint "Your MySQL version ".$myvar{'version'}." is EOL software! Upgrade soon!\n"; } elsif ($mysqlvermajor == 5) { goodprint "Currently running supported MySQL version ".$myvar{'version'}."\n"; } else { badprint "Currently running unsupported MySQL version ".$myvar{'version'}."\n"; } } # Checks for 32-bit boxes with more than 2GB of RAM my ($arch); sub check_architecture { if ($doremote eq 1) { return; } if (`uname` =~ /SunOS/ && `isainfo -b` =~ /64/) { $arch = 64; goodprint "Operating on 64-bit architecture\n"; } elsif (`uname` !~ /SunOS/ && `uname -m` =~ /64/) { $arch = 64; goodprint "Operating on 64-bit architecture\n"; } else { $arch = 32; if ($physical_memory > 2147483648) { badprint "Switch to 64-bit OS - MySQL cannot currently use all of your RAM\n"; } else { goodprint "Operating on 32-bit architecture with less than 2GB RAM\n"; } } } # Start up a ton of storage engine counts/statistics my (%enginestats,%enginecount,$fragtables); sub check_storage_engines { if ($opt{skipsize} eq 1) { print "\n-------- Storage Engine Statistics -------------------------------------------\n"; infoprint "Skipped due to --skipsize option\n"; return; } print "\n-------- Storage Engine Statistics -------------------------------------------\n"; infoprint "Status: "; my $engines; $engines .= (defined $myvar{'have_archive'} && $myvar{'have_archive'} eq "YES")? greenwrap "+Archive " : redwrap "-Archive " ; $engines .= (defined $myvar{'have_bdb'} && $myvar{'have_bdb'} eq "YES")? greenwrap "+BDB " : redwrap "-BDB " ; $engines .= (defined $myvar{'have_federated'} && $myvar{'have_federated'} eq "YES")? greenwrap "+Federated " : redwrap "-Federated " ; $engines .= (defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES")? greenwrap "+InnoDB " : redwrap "-InnoDB " ; $engines .= (defined $myvar{'have_isam'} && $myvar{'have_isam'} eq "YES")? greenwrap "+ISAM " : redwrap "-ISAM " ; $engines .= (defined $myvar{'have_ndbcluster'} && $myvar{'have_ndbcluster'} eq "YES")? greenwrap "+NDBCluster " : redwrap "-NDBCluster " ; print "$engines\n"; if ($mysqlvermajor >= 5) { # MySQL 5 servers can have table sizes calculated quickly from information schema my @templist = `mysql $mysqllogin -Bse "SELECT ENGINE,SUM(DATA_LENGTH),COUNT(ENGINE) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') AND ENGINE IS NOT NULL GROUP BY ENGINE ORDER BY ENGINE ASC;"`; foreach my $line (@templist) { my ($engine,$size,$count); ($engine,$size,$count) = $line =~ /([a-zA-Z_]*)\s+(\d+)\s+(\d+)/; if (!defined($size)) { next; } $enginestats{$engine} = $size; $enginecount{$engine} = $count; } $fragtables = `mysql $mysqllogin -Bse "SELECT COUNT(TABLE_NAME) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema','mysql') AND Data_free > 0 AND NOT ENGINE='MEMORY';"`; chomp($fragtables); } else { # MySQL < 5 servers take a lot of work to get table sizes my @tblist; # Now we build a database list, and loop through it to get storage engine stats for tables my @dblist = `mysql $mysqllogin -Bse "SHOW DATABASES"`; foreach my $db (@dblist) { chomp($db); if ($db eq "information_schema") { next; } if ($mysqlvermajor == 3 || ($mysqlvermajor == 4 && $mysqlverminor == 0)) { # MySQL 3.23/4.0 keeps Data_Length in the 6th column push (@tblist,`mysql $mysqllogin -Bse "SHOW TABLE STATUS FROM \\\`$db\\\`" | awk '{print \$2,\$6,\$9}'`); } else { # MySQL 4.1+ keeps Data_Length in the 7th column push (@tblist,`mysql $mysqllogin -Bse "SHOW TABLE STATUS FROM \\\`$db\\\`" | awk '{print \$2,\$7,\$10}'`); } } # Parse through the table list to generate storage engine counts/statistics $fragtables = 0; foreach my $line (@tblist) { chomp($line); $line =~ /([a-zA-Z_]*)\s+(\d+)\s+(\d+)/; my $engine = $1; my $size = $2; my $datafree = $3; if ($size !~ /^\d+$/) { $size = 0; } if (defined $enginestats{$engine}) { $enginestats{$engine} += $size; $enginecount{$engine} += 1; } else { $enginestats{$engine} = $size; $enginecount{$engine} = 1; } if ($datafree > 0) { $fragtables++; } } } while (my ($engine,$size) = each(%enginestats)) { infoprint "Data in $engine tables: ".hr_bytes_rnd($size)." (Tables: ".$enginecount{$engine}.")"."\n"; } # If the storage engine isn't being used, recommend it to be disabled if (!defined $enginestats{'InnoDB'} && defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES") { badprint "InnoDB is enabled but isn't being used\n"; push(@generalrec,"Add skip-innodb to MySQL configuration to disable InnoDB"); } if (!defined $enginestats{'BerkeleyDB'} && defined $myvar{'have_bdb'} && $myvar{'have_bdb'} eq "YES") { badprint "BDB is enabled but isn't being used\n"; push(@generalrec,"Add skip-bdb to MySQL configuration to disable BDB"); } if (!defined $enginestats{'ISAM'} && defined $myvar{'have_isam'} && $myvar{'have_isam'} eq "YES") { badprint "ISAM is enabled but isn't being used\n"; push(@generalrec,"Add skip-isam to MySQL configuration to disable ISAM (MySQL > 4.1.0)"); } # Fragmented tables if ($fragtables > 0) { badprint "Total fragmented tables: $fragtables\n"; push(@generalrec,"Run OPTIMIZE TABLE to defragment tables for better performance"); } else { goodprint "Total fragmented tables: $fragtables\n"; } } my %mycalc; sub calculations { if ($mystat{'Questions'} < 1) { badprint "Your server has not answered any queries - cannot continue..."; exit 0; } # Per-thread memory if ($mysqlvermajor > 3) { $mycalc{'per_thread_buffers'} = $myvar{'read_buffer_size'} + $myvar{'read_rnd_buffer_size'} + $myvar{'sort_buffer_size'} + $myvar{'thread_stack'} + $myvar{'join_buffer_size'}; } else { $mycalc{'per_thread_buffers'} = $myvar{'record_buffer'} + $myvar{'record_rnd_buffer'} + $myvar{'sort_buffer'} + $myvar{'thread_stack'} + $myvar{'join_buffer_size'}; } $mycalc{'total_per_thread_buffers'} = $mycalc{'per_thread_buffers'} * $myvar{'max_connections'}; $mycalc{'max_total_per_thread_buffers'} = $mycalc{'per_thread_buffers'} * $mystat{'Max_used_connections'}; # Server-wide memory $mycalc{'max_tmp_table_size'} = ($myvar{'tmp_table_size'} > $myvar{'max_heap_table_size'}) ? $myvar{'max_heap_table_size'} : $myvar{'tmp_table_size'} ; $mycalc{'server_buffers'} = $myvar{'key_buffer_size'} + $mycalc{'max_tmp_table_size'}; $mycalc{'server_buffers'} += (defined $myvar{'innodb_buffer_pool_size'}) ? $myvar{'innodb_buffer_pool_size'} : 0 ; $mycalc{'server_buffers'} += (defined $myvar{'innodb_additional_mem_pool_size'}) ? $myvar{'innodb_additional_mem_pool_size'} : 0 ; $mycalc{'server_buffers'} += (defined $myvar{'innodb_log_buffer_size'}) ? $myvar{'innodb_log_buffer_size'} : 0 ; $mycalc{'server_buffers'} += (defined $myvar{'query_cache_size'}) ? $myvar{'query_cache_size'} : 0 ; # Global memory $mycalc{'max_used_memory'} = $mycalc{'server_buffers'} + $mycalc{"max_total_per_thread_buffers"}; $mycalc{'total_possible_used_memory'} = $mycalc{'server_buffers'} + $mycalc{'total_per_thread_buffers'}; $mycalc{'pct_physical_memory'} = int(($mycalc{'total_possible_used_memory'} * 100) / $physical_memory); # Slow queries $mycalc{'pct_slow_queries'} = int(($mystat{'Slow_queries'}/$mystat{'Questions'}) * 100); # Connections $mycalc{'pct_connections_used'} = int(($mystat{'Max_used_connections'}/$myvar{'max_connections'}) * 100); $mycalc{'pct_connections_used'} = ($mycalc{'pct_connections_used'} > 100) ? 100 : $mycalc{'pct_connections_used'} ; # Key buffers if ($mysqlvermajor > 3 && !($mysqlvermajor == 4 && $mysqlverminor == 0)) { $mycalc{'pct_key_buffer_used'} = sprintf("%.1f",(1 - (($mystat{'Key_blocks_unused'} * $myvar{'key_cache_block_size'}) / $myvar{'key_buffer_size'})) * 100); } if ($mystat{'Key_read_requests'} > 0) { $mycalc{'pct_keys_from_mem'} = sprintf("%.1f",(100 - (($mystat{'Key_reads'} / $mystat{'Key_read_requests'}) * 100))); } else { $mycalc{'pct_keys_from_mem'} = 0; } if ($doremote eq 0 and $mysqlvermajor < 5) { $mycalc{'total_myisam_indexes'} = `find $myvar{'datadir'} -name '*.MYI' 2>&1 | xargs du -L $duflags '{}' 2>&1 | awk '{ s += \$1 } END { printf (\"%d\",s) }'`; } elsif ($mysqlvermajor >= 5) { $mycalc{'total_myisam_indexes'} = `mysql $mysqllogin -Bse "SELECT IFNULL(SUM(INDEX_LENGTH),0) FROM information_schema.TABLES WHERE TABLE_SCHEMA NOT IN ('information_schema') AND ENGINE = 'MyISAM';"`; } if (defined $mycalc{'total_myisam_indexes'} and $mycalc{'total_myisam_indexes'} =~ /^0\n$/) { $mycalc{'total_myisam_indexes'} = "fail"; } elsif (defined $mycalc{'total_myisam_indexes'}) { chomp($mycalc{'total_myisam_indexes'}); } # Query cache if ($mysqlvermajor > 3) { $mycalc{'query_cache_efficiency'} = sprintf("%.1f",($mystat{'Qcache_hits'} / ($mystat{'Com_select'} + $mystat{'Qcache_hits'})) * 100); if ($myvar{'query_cache_size'}) { $mycalc{'pct_query_cache_used'} = sprintf("%.1f",100 - ($mystat{'Qcache_free_memory'} / $myvar{'query_cache_size'}) * 100); } if ($mystat{'Qcache_lowmem_prunes'} == 0) { $mycalc{'query_cache_prunes_per_day'} = 0; } else { $mycalc{'query_cache_prunes_per_day'} = int($mystat{'Qcache_lowmem_prunes'} / ($mystat{'Uptime'}/86400)); } } # Sorting $mycalc{'total_sorts'} = $mystat{'Sort_scan'} + $mystat{'Sort_range'}; if ($mycalc{'total_sorts'} > 0) { $mycalc{'pct_temp_sort_table'} = int(($mystat{'Sort_merge_passes'} / $mycalc{'total_sorts'}) * 100); } # Joins $mycalc{'joins_without_indexes'} = $mystat{'Select_range_check'} + $mystat{'Select_full_join'}; $mycalc{'joins_without_indexes_per_day'} = int($mycalc{'joins_without_indexes'} / ($mystat{'Uptime'}/86400)); # Temporary tables if ($mystat{'Created_tmp_tables'} > 0) { if ($mystat{'Created_tmp_disk_tables'} > 0) { $mycalc{'pct_temp_disk'} = int(($mystat{'Created_tmp_disk_tables'} / ($mystat{'Created_tmp_tables'} + $mystat{'Created_tmp_disk_tables'})) * 100); } else { $mycalc{'pct_temp_disk'} = 0; } } # Table cache if ($mystat{'Opened_tables'} > 0) { $mycalc{'table_cache_hit_rate'} = int($mystat{'Open_tables'}*100/$mystat{'Opened_tables'}); } else { $mycalc{'table_cache_hit_rate'} = 100; } # Open files if ($myvar{'open_files_limit'} > 0) { $mycalc{'pct_files_open'} = int($mystat{'Open_files'}*100/$myvar{'open_files_limit'}); } # Table locks if ($mystat{'Table_locks_immediate'} > 0) { if ($mystat{'Table_locks_waited'} == 0) { $mycalc{'pct_table_locks_immediate'} = 100; } else { $mycalc{'pct_table_locks_immediate'} = int($mystat{'Table_locks_immediate'}*100/($mystat{'Table_locks_waited'} + $mystat{'Table_locks_immediate'})); } } # Thread cache $mycalc{'thread_cache_hit_rate'} = int(100 - (($mystat{'Threads_created'} / $mystat{'Connections'}) * 100)); # Other if ($mystat{'Connections'} > 0) { $mycalc{'pct_aborted_connections'} = int(($mystat{'Aborted_connects'}/$mystat{'Connections'}) * 100); } if ($mystat{'Questions'} > 0) { $mycalc{'total_reads'} = $mystat{'Com_select'}; $mycalc{'total_writes'} = $mystat{'Com_delete'} + $mystat{'Com_insert'} + $mystat{'Com_update'} + $mystat{'Com_replace'}; if ($mycalc{'total_reads'} == 0) { $mycalc{'pct_reads'} = 0; $mycalc{'pct_writes'} = 100; } else { $mycalc{'pct_reads'} = int(($mycalc{'total_reads'}/($mycalc{'total_reads'}+$mycalc{'total_writes'})) * 100); $mycalc{'pct_writes'} = 100-$mycalc{'pct_reads'}; } } # InnoDB if ($myvar{'have_innodb'} eq "YES") { $mycalc{'innodb_log_size_pct'} = ($myvar{'innodb_log_file_size'} * 100 / $myvar{'innodb_buffer_pool_size'}); } } sub mysql_stats { print "\n-------- Performance Metrics -------------------------------------------------\n"; # Show uptime, queries per second, connections, traffic stats my $qps; if ($mystat{'Uptime'} > 0) { $qps = sprintf("%.3f",$mystat{'Questions'}/$mystat{'Uptime'}); } if ($mystat{'Uptime'} < 86400) { push(@generalrec,"MySQL started within last 24 hours - recommendations may be inaccurate"); } infoprint "Up for: ".pretty_uptime($mystat{'Uptime'})." (".hr_num($mystat{'Questions'}). " q [".hr_num($qps)." qps], ".hr_num($mystat{'Connections'})." conn,". " TX: ".hr_num($mystat{'Bytes_sent'}).", RX: ".hr_num($mystat{'Bytes_received'}).")\n"; infoprint "Reads / Writes: ".$mycalc{'pct_reads'}."% / ".$mycalc{'pct_writes'}."%\n"; # Memory usage infoprint "Total buffers: ".hr_bytes($mycalc{'server_buffers'})." global + ".hr_bytes($mycalc{'per_thread_buffers'})." per thread ($myvar{'max_connections'} max threads)\n"; if ($mycalc{'total_possible_used_memory'} > 2*1024*1024*1024 && $arch eq 32) { badprint "Allocating > 2GB RAM on 32-bit systems can cause system instability\n"; badprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; } elsif ($mycalc{'pct_physical_memory'} > 85) { badprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; push(@generalrec,"Reduce your overall MySQL memory footprint for system stability"); } else { goodprint "Maximum possible memory usage: ".hr_bytes($mycalc{'total_possible_used_memory'})." ($mycalc{'pct_physical_memory'}% of installed RAM)\n"; } # Slow queries if ($mycalc{'pct_slow_queries'} > 5) { badprint "Slow queries: $mycalc{'pct_slow_queries'}% (".hr_num($mystat{'Slow_queries'})."/".hr_num($mystat{'Questions'}).")\n"; } else { goodprint "Slow queries: $mycalc{'pct_slow_queries'}% (".hr_num($mystat{'Slow_queries'})."/".hr_num($mystat{'Questions'}).")\n"; } if ($myvar{'long_query_time'} > 10) { push(@adjvars,"long_query_time (<= 10)"); } if (defined($myvar{'log_slow_queries'})) { if ($myvar{'log_slow_queries'} eq "OFF") { push(@generalrec,"Enable the slow query log to troubleshoot bad queries"); } } # Connections if ($mycalc{'pct_connections_used'} > 85) { badprint "Highest connection usage: $mycalc{'pct_connections_used'}% ($mystat{'Max_used_connections'}/$myvar{'max_connections'})\n"; push(@adjvars,"max_connections (> ".$myvar{'max_connections'}.")"); push(@adjvars,"wait_timeout (< ".$myvar{'wait_timeout'}.")","interactive_timeout (< ".$myvar{'interactive_timeout'}.")"); push(@generalrec,"Reduce or eliminate persistent connections to reduce connection usage") } else { goodprint "Highest usage of available connections: $mycalc{'pct_connections_used'}% ($mystat{'Max_used_connections'}/$myvar{'max_connections'})\n"; } # Key buffer if (!defined($mycalc{'total_myisam_indexes'}) and $doremote == 1) { push(@generalrec,"Unable to calculate MyISAM indexes on remote MySQL server < 5.0.0"); } elsif ($mycalc{'total_myisam_indexes'} =~ /^fail$/) { badprint "Cannot calculate MyISAM index size - re-run script as root user\n"; } elsif ($mycalc{'total_myisam_indexes'} == "0") { badprint "None of your MyISAM tables are indexed - add indexes immediately\n"; } else { if ($myvar{'key_buffer_size'} < $mycalc{'total_myisam_indexes'} && $mycalc{'pct_keys_from_mem'} < 95) { badprint "Key buffer size / total MyISAM indexes: ".hr_bytes($myvar{'key_buffer_size'})."/".hr_bytes($mycalc{'total_myisam_indexes'})."\n"; push(@adjvars,"key_buffer_size (> ".hr_bytes($mycalc{'total_myisam_indexes'}).")"); } else { goodprint "Key buffer size / total MyISAM indexes: ".hr_bytes($myvar{'key_buffer_size'})."/".hr_bytes($mycalc{'total_myisam_indexes'})."\n"; } if ($mystat{'Key_read_requests'} > 0) { if ($mycalc{'pct_keys_from_mem'} < 95) { badprint "Key buffer hit rate: $mycalc{'pct_keys_from_mem'}% (".hr_num($mystat{'Key_read_requests'})." cached / ".hr_num($mystat{'Key_reads'})." reads)\n"; } else { goodprint "Key buffer hit rate: $mycalc{'pct_keys_from_mem'}% (".hr_num($mystat{'Key_read_requests'})." cached / ".hr_num($mystat{'Key_reads'})." reads)\n"; } } else { # No queries have run that would use keys } } # Query cache if ($mysqlvermajor < 4) { # MySQL versions < 4.01 don't support query caching push(@generalrec,"Upgrade MySQL to version 4+ to utilize query caching"); } elsif ($myvar{'query_cache_size'} < 1) { badprint "Query cache is disabled\n"; push(@adjvars,"query_cache_size (>= 8M)"); } elsif ($mystat{'Com_select'} == 0) { badprint "Query cache cannot be analyzed - no SELECT statements executed\n"; } else { if ($mycalc{'query_cache_efficiency'} < 20) { badprint "Query cache efficiency: $mycalc{'query_cache_efficiency'}% (".hr_num($mystat{'Qcache_hits'})." cached / ".hr_num($mystat{'Qcache_hits'}+$mystat{'Com_select'})." selects)\n"; push(@adjvars,"query_cache_limit (> ".hr_bytes_rnd($myvar{'query_cache_limit'}).", or use smaller result sets)"); } else { goodprint "Query cache efficiency: $mycalc{'query_cache_efficiency'}% (".hr_num($mystat{'Qcache_hits'})." cached / ".hr_num($mystat{'Qcache_hits'}+$mystat{'Com_select'})." selects)\n"; } if ($mycalc{'query_cache_prunes_per_day'} > 98) { badprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n"; if ($myvar{'query_cache_size'} > 128*1024*1024) { push(@generalrec,"Increasing the query_cache size over 128M may reduce performance"); push(@adjvars,"query_cache_size (> ".hr_bytes_rnd($myvar{'query_cache_size'}).") [see warning above]"); } else { push(@adjvars,"query_cache_size (> ".hr_bytes_rnd($myvar{'query_cache_size'}).")"); } } else { goodprint "Query cache prunes per day: $mycalc{'query_cache_prunes_per_day'}\n"; } } # Sorting if ($mycalc{'total_sorts'} == 0) { # For the sake of space, we will be quiet here # No sorts have run yet } elsif ($mycalc{'pct_temp_sort_table'} > 10) { badprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}% (".hr_num($mystat{'Sort_merge_passes'})." temp sorts / ".hr_num($mycalc{'total_sorts'})." sorts)\n"; push(@adjvars,"sort_buffer_size (> ".hr_bytes_rnd($myvar{'sort_buffer_size'}).")"); push(@adjvars,"read_rnd_buffer_size (> ".hr_bytes_rnd($myvar{'read_rnd_buffer_size'}).")"); } else { goodprint "Sorts requiring temporary tables: $mycalc{'pct_temp_sort_table'}% (".hr_num($mystat{'Sort_merge_passes'})." temp sorts / ".hr_num($mycalc{'total_sorts'})." sorts)\n"; } # Joins if ($mycalc{'joins_without_indexes_per_day'} > 250) { badprint "Joins performed without indexes: $mycalc{'joins_without_indexes'}\n"; push(@adjvars,"join_buffer_size (> ".hr_bytes($myvar{'join_buffer_size'}).", or always use indexes with joins)"); push(@generalrec,"Adjust your join queries to always utilize indexes"); } else { # For the sake of space, we will be quiet here # No joins have run without indexes } # Temporary tables if ($mystat{'Created_tmp_tables'} > 0) { if ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} < 256*1024*1024) { badprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n"; push(@adjvars,"tmp_table_size (> ".hr_bytes_rnd($myvar{'tmp_table_size'}).")"); push(@adjvars,"max_heap_table_size (> ".hr_bytes_rnd($myvar{'max_heap_table_size'}).")"); push(@generalrec,"When making adjustments, make tmp_table_size/max_heap_table_size equal"); push(@generalrec,"Reduce your SELECT DISTINCT queries without LIMIT clauses"); } elsif ($mycalc{'pct_temp_disk'} > 25 && $mycalc{'max_tmp_table_size'} >= 256) { badprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n"; push(@generalrec,"Temporary table size is already large - reduce result set size"); push(@generalrec,"Reduce your SELECT DISTINCT queries without LIMIT clauses"); } else { goodprint "Temporary tables created on disk: $mycalc{'pct_temp_disk'}% (".hr_num($mystat{'Created_tmp_disk_tables'})." on disk / ".hr_num($mystat{'Created_tmp_disk_tables'} + $mystat{'Created_tmp_tables'})." total)\n"; } } else { # For the sake of space, we will be quiet here # No temporary tables have been created } # Thread cache if ($myvar{'thread_cache_size'} eq 0) { badprint "Thread cache is disabled\n"; push(@generalrec,"Set thread_cache_size to 4 as a starting value"); push(@adjvars,"thread_cache_size (start at 4)"); } else { if ($mycalc{'thread_cache_hit_rate'} <= 50) { badprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}% (".hr_num($mystat{'Threads_created'})." created / ".hr_num($mystat{'Connections'})." connections)\n"; push(@adjvars,"thread_cache_size (> $myvar{'thread_cache_size'})"); } else { goodprint "Thread cache hit rate: $mycalc{'thread_cache_hit_rate'}% (".hr_num($mystat{'Threads_created'})." created / ".hr_num($mystat{'Connections'})." connections)\n"; } } # Table cache if ($mystat{'Open_tables'} > 0) { if ($mycalc{'table_cache_hit_rate'} < 20) { badprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}% (".hr_num($mystat{'Open_tables'})." open / ".hr_num($mystat{'Opened_tables'})." opened)\n"; if ($mysqlvermajor eq 6 || ($mysqlvermajor eq 5 && $mysqlverminor ge 1)) { push(@adjvars,"table_cache (> ".$myvar{'table_open_cache'}.")"); } else { push(@adjvars,"table_cache (> ".$myvar{'table_cache'}.")"); } push(@generalrec,"Increase table_cache gradually to avoid file descriptor limits"); } else { goodprint "Table cache hit rate: $mycalc{'table_cache_hit_rate'}% (".hr_num($mystat{'Open_tables'})." open / ".hr_num($mystat{'Opened_tables'})." opened)\n"; } } # Open files if (defined $mycalc{'pct_files_open'}) { if ($mycalc{'pct_files_open'} > 85) { badprint "Open file limit used: $mycalc{'pct_files_open'}% (".hr_num($mystat{'Open_files'})."/".hr_num($myvar{'open_files_limit'}).")\n"; push(@adjvars,"open_files_limit (> ".$myvar{'open_files_limit'}.")"); } else { goodprint "Open file limit used: $mycalc{'pct_files_open'}% (".hr_num($mystat{'Open_files'})."/".hr_num($myvar{'open_files_limit'}).")\n"; } } # Table locks if (defined $mycalc{'pct_table_locks_immediate'}) { if ($mycalc{'pct_table_locks_immediate'} < 95) { badprint "Table locks acquired immediately: $mycalc{'pct_table_locks_immediate'}%\n"; push(@generalrec,"Optimize queries and/or use InnoDB to reduce lock wait"); } else { goodprint "Table locks acquired immediately: $mycalc{'pct_table_locks_immediate'}% (".hr_num($mystat{'Table_locks_immediate'})." immediate / ".hr_num($mystat{'Table_locks_waited'}+$mystat{'Table_locks_immediate'})." locks)\n"; } } # Performance options if ($mysqlvermajor == 3 || ($mysqlvermajor == 4 && $mysqlverminor == 0)) { push(@generalrec,"Upgrade to MySQL 4.1+ to use concurrent MyISAM inserts"); } elsif ($myvar{'concurrent_insert'} eq "OFF") { push(@generalrec,"Enable concurrent_insert by setting it to 'ON'"); } elsif ($myvar{'concurrent_insert'} eq 0) { push(@generalrec,"Enable concurrent_insert by setting it to 1"); } if ($mycalc{'pct_aborted_connections'} > 5) { badprint "Connections aborted: ".$mycalc{'pct_aborted_connections'}."%\n"; push(@generalrec,"Your applications are not closing MySQL connections properly"); } # InnoDB if (defined $myvar{'have_innodb'} && $myvar{'have_innodb'} eq "YES" && defined $enginestats{'InnoDB'}) { if ($myvar{'innodb_buffer_pool_size'} > $enginestats{'InnoDB'}) { goodprint "InnoDB data size / buffer pool: ".hr_bytes($enginestats{'InnoDB'})."/".hr_bytes($myvar{'innodb_buffer_pool_size'})."\n"; } else { badprint "InnoDB data size / buffer pool: ".hr_bytes($enginestats{'InnoDB'})."/".hr_bytes($myvar{'innodb_buffer_pool_size'})."\n"; push(@adjvars,"innodb_buffer_pool_size (>= ".hr_bytes_rnd($enginestats{'InnoDB'}).")"); } } } # Take the two recommendation arrays and display them at the end of the output sub make_recommendations { print "\n-------- Recommendations -----------------------------------------------------\n"; if (@generalrec > 0) { print "General recommendations:\n"; foreach (@generalrec) { print " ".$_."\n"; } } if (@adjvars > 0) { print "Variables to adjust:\n"; if ($mycalc{'pct_physical_memory'} > 90) { print " *** MySQL's maximum memory usage is dangerously high ***\n". " *** Add RAM before increasing MySQL buffer variables ***\n"; } foreach (@adjvars) { print " ".$_."\n"; } } if (@generalrec == 0 && @adjvars ==0) { print "No additional performance recommendations are available.\n" } print "\n"; } # --------------------------------------------------------------------------- # BEGIN 'MAIN' # --------------------------------------------------------------------------- print "\n >> MySQLTuner $tunerversion - Major Hayden <major\@mhtx.net>\n". " >> Bug reports, feature requests, and downloads at http://mysqltuner.com/\n". " >> Run with '--help' for additional options and output filtering\n"; mysql_setup; # Gotta login first os_setup; # Set up some OS variables get_all_vars; # Toss variables/status into hashes validate_tuner_version; # Check current MySQLTuner version validate_mysql_version; # Check current MySQL version check_architecture; # Suggest 64-bit upgrade check_storage_engines; # Show enabled storage engines calculations; # Calculate everything we need mysql_stats; # Print the server stats make_recommendations; # Make recommendations based on stats # --------------------------------------------------------------------------- # END 'MAIN' # ---------------------------------------------------------------------------

Mysql Query Tuning

1.-http://www.webexperto.com/articulos/art/267/optimizar-consultas-mysql/

2.-