After upgrading a test Db2 subsystem cannot get into Sysview Performance Monitor for Db2 for z/OS (IDB2) from the Db2 tools for z/OS
Main Menu. Selecting 'IS' for Sysview Performance Monitor for Db2 for z/OS (IDB2) from the Db2 tools main menu receive message:
SYSVIEW FOR DB2 USER SESSION FAILED WITH RC=12 ENSURE THE POST INSTALL STEPS HAVE BEEN COMPLETED BEFORE INVOKING THE USER INTERFACE.
Maintenance had been applied to the Db2 tools and the propagation of the SMP/E Target libraries to the Db2 tools
Runtime libraries caused the previously modified IDB2 CLIST (from the Post Install process) to be overlaid with
a 'vanilla' unedited version, thus the cause of the error message.
A backup copy of the edited IDB2 clist was copied into the Db2 tools runtime clist (CDBACLS0) library.