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UTS PBG, SINGLETON SELECT and Lock Avoidance.

Hello Db2 for Z/OS Development.

Apar PM89016 was created several years ago to implement the lock avoidance for singleton SELECTs with

ISO(CS) and CD(YES) when R-scan is used, or the index that is chosen has

matching predicates on all columns of the index.

Recently a new Apar PH19483 (UI67378) has reverted this behaviour to avoid receiving unexpected SQLCODE +100 when there is INSERT/DELETE/UPDATE activity happening concurrently on the same table.

As can be read on the text of such new Apar PH19483:

"PROBLEM CONCLUSION:

Db2 code is changed to acquire locking for singleton SELECTs meeting the criteria described above. As a result of this change, the user may see increased locking activity and slower query performance for such singleton SELECTs; the locking is mandatory to prevent concurrent operations from causing the incorrect output. If the user desires less locking activity, consider using CURRENTDATA(NO). "

In our case (Bankinter) 80% of our read Accesses are Singleton Selects, resolved with skinny index-to-data (equal predicates on all index columns) access instead of Cursors, so the impact of not "profiting" of lock avoidance feature on those singleton Selects with ISO(CS) and CD(YES) is huge. Furthermore We can't use CURRENTDATA(NO) due to our business processes read with Singleton Select most of the times, but they also read by read-only (or ambiguous) cursors and modify afterwards with Delete or Update statements.

  • Avatar32.5fb70cce7410889e661286fd7f1897de Guest
  • Nov 17 2020
  • Future consideration
Who would benefit from this IDEA? All users that will practice Singleton Select; specially if Data Sharing.
How should it work?

So I would like to request the possibility of including for instance a hidden Zparm which set to a certain value would allow Clients like mine (Bankinter) to profit from the code included on Apar PM89016 (that is lock avoidance for these singleton Selects) assuming that We can receive sometimes unexpected SQLCODEs +100, meanwhile such Zparm let with the default value would allow the Clients which doesn't want receive those SQLCODEs +100 to use the code included on Apar PH19483.

Idea Priority Urgent
Priority Justification Our SO customer requieres it. 80% of our read Accesses are Singleton Selects, resolved with skinny index-to-data (equal predicates on all index columns) access instead of Cursors, so the impact of not "profiting" of lock avoidance feature on those singleton Selects with ISO(CS) and CD(YES) is huge.
Client Name Bankinter
  • Attach files
  • Admin
    Janet Figone commented
    17 Dec, 2020 06:17pm

    Thanks for bringing this concern. PH19483 resolved intermitted incorrect out with CD(YES) when SELECT and DELETE are executed concurrently. While the change is to honor the semantics of ISO(CS) CD(YES), we understand the performance penalty from the lack of lock avoidance. We will conduct further investigation if there is any solution


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