IBM Support

PM62786: SUBPOOL 231 KEY 7 STORAGE GROWTH IN ECSA FOR ORPHANED ENTRIES OF SADL/CTIB AFTER UTILITY JOB EXECUTIONS.

A fix is available

Subscribe

You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • Slow growth in ECSA for DB2 subsystem. Utility jobs that have
    terminated will leave orphaned 'OG' entries in OWNCOMM report
    for SADL/CTIB control blocks. Dump will show small number of
    entries for SADL (100-150) but more for CTIBs more than 2000.
    The CTIBs are also larger than SADL entires in size.
    No abends in DB2, just accumulated entries for utility job
    executions in OG since IPL.
    
    SUBPOOL NAME: SADL for SSAM  AMGSSIDP
    PHB for this pool shows several entries like this:
    .
    1442C5B0: 00000078 0070006C E2C1C4D3 000A8000 000A0000
    ...%SADL........  N/A       DSN3AUCN +2655    UK67202
     1442C638: 00000078 0070006C E2C1C4D3 000A8000 000A0000
    ...%SADL........  N/A       DSN3AUCN +2655    UK67202
    
    Additional keywords:
      ECSA STORAGE LEAK
      SUBPOOL 231 0231 SUBPOOL231 SUBPOOL0231 SP231 SP0231
      KEY 7 KEY7 storage
      SADL SSAM CTIB
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 9 for z/OS and DB2 10 for z/OS       *
    *                 utility users of LOAD with TRUSTED CONTEXT   *
    ****************************************************************
    * PROBLEM DESCRIPTION: LOAD with TRUSTED CONTEXT results in    *
    *                      storage growth of subpool 231 in the    *
    *                      DBM1 address space                      *
    ****************************************************************
    * RECOMMENDATION: Apply corrective PTF when available          *
    ****************************************************************
    LOAD with TRUSTED CONTEXT results in subpool 231 storage growth
    in the DBM1 address space.  This is due to LOAD subtasks
    overlaying the address of one of their control blocks with the
    address of a control block from the LOAD main task.  This caused
    the storage of the original control block to not be freed when
    the subtask went through deallocation which, in turn, resulted
    in the DBM1 address space running low on storage.
    

Problem conclusion

  • LOAD code has been modified to save the pointer for the subtask
    control block before overlaying it with the pointer from the
    main task control block.
    
    Subsystem Services code has been changed to make sure pointers
    are set up correctly so the utility subtask control blocks can
    be deallocated correctly.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM62786

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-18

  • Closed date

    2012-06-27

  • Last modified date

    2012-08-08

  • APAR is sysrouted FROM one or more of the following:

  • APAR is sysrouted TO one or more of the following:

    UK79871 UK79872

Modules/Macros

  • DSNUGSIT DSN3EOT0 DSN3ID30
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK79871

       UP12/07/12 P F207

  • R910 PSY UK79872

       UP12/07/12 P F207

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.

[{"Business Unit":{"code":"BU059","label":"IBM Software w\/o TPS"},"Product":{"code":"SSEPEK","label":"Db2 for z\/OS"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}},{"Business Unit":{"code":"BU054","label":"Systems w\/TPS"},"Product":{"code":"SG19M","label":"APARs - z\/OS environment"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"9.1","Edition":"","Line of Business":{"code":"","label":""}}]

Document Information

Modified date:
08 August 2012