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User sees an additional MON trace Class 29 being started. What is this?

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Article ID: 54148

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Updated On:

Products

RC Compare for DB2 for z/OS Bind Analyzer for DB2 for z/OS SQL-Ease for DB2 for z/OS SYSVIEW Performance Management Option for DB2 for z/OS Plan Analyzer for DB2 for z/OS Subsystem Analyzer for DB2 for z/OS Database Analyzer for DB2 for z/OS Fast Unload for DB2 for z/OS Fast Check for DB2 for z/OS Fast Index for DB2 for z/OS Rapid Reorg for DB2 for z/OS

Issue/Introduction

Description:

We recently upgraded to 11.5 SP1 and noticed that when we do a Display Trace command, that we now see a MON trace class 29 active. We found in the Systems Guide where: "If your data collector is using IFI=NO or IFI=READS, you will see a performance trace active with class 29. Class 29 has no trace records currently defined for it."
We use IFI=YES. Can you tell me what MON trace Class 29 is used for when IFI=YES?

Solution:

IBM has changed the way it handles the start of unqualified class 2 or 3 traces that include explicit IFCID records under DB2 V8.
As a result, the CA Insight Performance Monitor for DB2 now uses a second Monitor Class 29 trace in order to get data for specific IFCID records that are used by IQL requests at start-up.

Environment

Release:
Component: CIDB