DSNACAF
DSNACAF establishes the Db2 release using the Release Indicator Block (RIB) when Call Attach is utilized to connect to Db2.
Reference Sources
IBM Db2 for OS/390, Installation Guide, GC26-8970
IBM Db2 for OS/390, Messages and Codes, GC26-8979
IBM Db2 for OS/390, Application Programming and SQL Guide, SC26-8958
IBM Db2 for OS/390, Administration Guide, SC26-8957