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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on Jun 24, 2020

RELATED IDEAS

Begin / End COMMIT instrumentation for DRDA, CICS/IMS

Complex CICS/IMS or DRDA transactions (involving multiple programs with an implicit Commit at the end) are incorrectly presented on the Omegamon Accounting Report/Trace. By design the costs of the tough SYNC (COMMIT) operation are added to the last invoked Db2 package and its SQLs. That leads to incorrect reports, forcing DBAdmins to be concerned about SQLs which actually have no problems.

For example take the famous INSERT performance issue (usually executed as the last for a business transaction). Companies spend millions to improve an INSERT performance although there is no INSERT problem but the costs of the

COMMIT.There were two cases closed to establish that behaviour: TS002976436 and TS002533198.

We would like Begin/End COMMIT instrumentation implemented in Db2, that would allow for precise reporting of the COMMIT elapsed and performance times. Later the OMPE Accounting/SQLACTIVITY Reports based on that information will give us much clear particular package overhead as well as exact COMMIT processing costs.

Needed by Date Jun 24, 2020
  • Guest
    Reply
    |     Jan 25, 2021

    Hello Janet ,


    According to my knowledge the problem appears on the border between Omegamon reports and the data Db2 prepares in the traces. Although OMPE SQLACTIVITY TRACE gives correct time for SYNC operation, unfortunately Omegamon can not generate correct OMPE ACCOUNTING REPORT/TRACE without changes in the traces/IFCIDs .
    Today OMPE ACCOUNTING generates misleading reports charging last invoked package with the costs of the COMMIT.

    Many sites worldwide base their analisys only on the Accounting because of its simplisity and because it is really tough to analyze SQLACTIVITY TRACE in a very large environment.

    Regards,
    Pawel Hryb

  • Admin
    Janet Figone
    Reply
    |     Jan 15, 2021

    Thanks for the suggestion. We would like to understand some details. Db2 today writes the following instrumentation for local attached transaction. We believe this should be enough information. Do you need more information for CICS/IMS ? Performance trace IFCID 88/89 (Begin/End of SYNC requests), IFCID 70/71 (Begin/End of commit phase 2). IFCID 3, accounting for local application also report the commit time under QWACAWTE. “

    For DRDA, we agree that the commit instrumentation is missing other than commit received in DDF section and accounting trace only reports the commit process as “Force LOG WRITE”. We need to investigate how we can implement this for DRDA, but please confirm the question on the local application.

    Thank you.

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