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Status Future consideration
Workspace Db2 for z/OS
Created by Guest
Created on Nov 30, 2022

RELATED IDEAS

Return information about a failed Lock-Escalation to the application

When a Lock-Escalation occurs it is documented by message DSNI031I (Lock Escalation has occurred) in the Db2-Master-Adressspace. But when a Lock-Escalation fails there is no documentation for this, instead it comes to a Timeout or Deadlock from a lock-change-request with Resource-Type 00000210 (Partition) and Resource-Name is the Tablespace-Partition that looks like this:


01.34.22 S0103665 DSNT375I <DBR2 PLAN=DISTSERV WITH 492

492 CORRELATION-ID=db2jcc_appli

492 CONNECTION-ID=SERVER

492 LUW-ID=G4EF5B19.MC1C.DC7B58B5C42B=57458

492

492 THREAD-INFO=Q100494:OSPE_LOCALHOST_6:421_Q100107:aspm.REORG_DATA:STAT

492 IC:259376357:*:<::4.239.91.25.22776.DC7B568542C9>

492 IS DEADLOCKED WITH PLAN=GK000421 WITH

492 CORRELATION-ID=POOLP98W0007

492 CONNECTION-ID=PRCICD0Z

492 LUW-ID=DESIKVE0.PRDBR300.DC7B58C47F53=23017

492 THREAD-INFO=Q100002:*:*:POOLP98W:STATIC:259466942:*:*

492 ON MEMBER DBR3

01.34.22 S0103665 DSNT501I <DBR2 DSNILMCL RESOURCE UNAVAILABLE 493

493 CORRELATION-ID=db2jcc_appli

493 CONNECTION-ID=SERVER

493 LUW-ID=G4EF5B19.MC1C.DC7B58B5C42B=57458

493 REASON 00C90088

493 TYPE 00000210

493 NAME MK400421.TSMK4000.00000001


The SQL ends with SQL-Code -911/-913 (Timeout or Deadlock), which means for many developers that they have a concurrency-problem with other applications, but they don’t see that the reason for this problem comes from too many changes within a single unit of work which leads to a lock-escalation. In the case above the application gets:


DSNT408I SQLCODE = -913, ERROR: UNSUCCESSFUL EXECUTION CAUSED BY

DEADLOCK OR TIMEOUT. REASON CODE 00C90088, TYPE OF RESOURCE

00000210, AND RESOURCE NAME MK400421.TSMK4000.00000001

DSNT418I SQLSTATE = 57033 SQLSTATE RETURN CODE

DSNT415I SQLERRP = DSNXRRC SQL PROCEDURE DETECTING ERROR

DSNT416I SQLERRD = 112 13172746 13172872 13226962 -975040510

536870912 SQL DIAGNOSTIC INFORMATION

DSNT416I SQLERRD = X'00000070' X'00C9000A' X'00C90088' X'00C9D3D2'

X'C5E21002' X'20000000' SQL DIAGNOSTIC INFORMATION


Suggestion: In case of an unsuccessful Lock-Escalation please return an SQL-Code -904, instead of -911/-913, with a Reason-Code that shows that this is a failed Lock-Escalation and return the Tablespace-Name in the message-text.

Alternativly if you don't want to change the SQL-Code, please return a Reason-Code that shows the failed Lock-Escalation.


Needed By Not sure -- Just thought it was cool
  • Admin
    Janet Figone
    Reply
    |     Apr 6, 2023

    Please ignore the brief state change to 'in development' - that was applied to this idea in errror. State has been moved back to 'future consideration'. Sorry for any confusion this may have caused.

  • Admin
    Janet Figone
    Reply
    |     Mar 14, 2023

    Dear Rolf, Thank you for submitting this enhancement request. Our Db2 for z/OS development team reviewed it and agree this would be useful. However, because our current 12 month roadmap is already completely booked, we cannot include it at this time. We have placed it in Future consideration and tagged it to re-review when planning for the content for the next upcoming roadmap(s) begin.

    We appreciate your input to the Db2 for z/OS development team. And we hope that you will continue to submit enhancement suggestions for improvements as customer feedback is a key component to shaping the future direction of Db2 for z/OS.

    Sincerely,

    Db2 for z/OS Team

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