Sysview for Db2 IQL request returning DBG03038E syntax error in r20 but same request does not in r19

Products

• SYSVIEW Performance Management Option for DB2 for z/OS

Issue/Introduction

The following error is revealed in the Sysview Performance Management Option for Db2 for z/OS (IDB2) r20 data collector log at startup
but the problem does not occur when running the IDB2 request in r19:

DBG03038E 07:45:18 THIS FIELD CANNOT BE USED IN DECLARE OR WHERE CLAUSE
          CMD-TXT(,4,16) = '-DIS'

Cause

IDB2 r20 introduced tighter controls over fields allowed to be used in a 'Where Clause' mostly relating to variable length fields, and in this case CMD-TXT.

Resolution

There has been a change in IDB2 r20 where stricter controls have been put in place for 'where clause' fields mostly relating to variable length fields
which CMD-TXT happens to be one of them. A sound circumvention is being offered to correct this failure by using IFCID 91 "COMMAND" to report
the end of the Db2 command execution instead of IFCID 90 "COMMAND-ST" reporting the start of the Db2 command. 

The following are the changes that were made:

Changed COMMAND-ST to COMMAND
Changed CMD-TXT to CMD-TXT-VAR field in WHERE clause (CMD-TXT-VAR is derived from CMD-TXT)
Changed the substring offset in the WHERE clause in the request:
CMD-TXT(,4,16) -> CMD-TXT-VAR(,4,14)
CMD-TXT(,4,3) -> CMD-TXT-VAR(,4,1)