Every time it’s more common SAP environments running with DB2.
Attached a video regarding the capabilities of DB2 with BLU Acceleration applied to SAP and all SAP notes to consider.
Surprising comparative with SAP HANA, and as with less complexity and investment, you get more performance.
Pay attention to the comparison with SAP HANA:
Attached also the IBM Redbook Architecting and Deploying DB2 with BLU Acceleration.