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Status Under review
Workspace Db2 for z/OS
Created by Guest
Created on Sep 27, 2023

Enable to check maximum LATCH retention time in DB2PE reports etc

[Current Product & Version]
-Db2 12 for z/OS
-IBM Tivoli OMEGAMON XE for DB2Performance Expert on z/OS v5.5
-z/OS v2.3
-WebSphere Application Server v9 for z/OS

Data sharing in three-way sysplex environment

Our customer is using WAS for z/OS and DB2 for z/OS on their mission critical system.
Several times our customers experienced slow transaction responsiveness and timeouts, severely impacting their business.
I opened CASE(TS013070610/TS013085686)to resolve this problem, but these CASEs does not identify the cause of the problem and does not currently resolve the problem.

This CASE explained that some read thread held S page latch waiting, it could cause the index split thread to wait on the page latch, so many transactions became wait or time out.
Unfortunately, it was not possible to identify the read thread holding S-LATCH for a long time from materials such as Db2 logs.

As a side note, obtaining SLIP dumps using SLIP traps is not acceptable due to concerns about reduced transaction response.
We believe that product improvements are necessary to identify the cause of this problem.


We request improvement so that we can know the maximum retention time of LATCH during transaction execution in the DB2PE accounting reports, etc.

Our customers can identify the cause of this problem, consider a solution, and expect normal and stable business operations.

Needed By Quarter