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IC78332: DEDUP OPERATIONS ATTEMPT TO RUN DEDUP MEDIA CONTROLLER TERMINATION LOGIC DURING BACKUP COMPLETION PHASE

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • The Assertion noticed internally  will not actually occur in a
    customer S build.  In the S build case, we will possibly send a
    targeted end message to the last BM with unpredictable results
    depending on possible timings.   The issue is during the final
    phase of a backup.  If there is a large delay in the amount of
    time it takes DB2 to open a session to write too, as compared to
    the amount of time it takes for the process reading the
    necessary log files and metadata files to write that information
    to buffer, then logic meant to protect against an end being sent
    to the writer at the time of the media writer's initialization,
    does not apply.
    

Local fix

  • It's relatively unlikely for the BM to finish entirely before
    the MC has time to initiate a session, but there is no real
    practical local fix if this should occur.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users using DB2 and the dedup keyword for backups            *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * This problem was caught via an Assert in internal testing.   *
    * Possible customer results are somewhat unpredictable based   *
    * on timing, but may include the termination of the media      *
    * writer, resulting in an incomplete backup.                   *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * move up to a fixpac with this fix.                           *
    ****************************************************************
    

Problem conclusion

  • in v97 this problem will be fixed in fp5
    

Temporary fix

  • special build.
    

Comments

APAR Information

  • APAR number

    IC78332

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2011-08-25

  • Closed date

    2012-01-17

  • Last modified date

    2012-01-17

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

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

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R950 PSN

       UP

  • R970 PSN

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IC78332

Modified date: 17 January 2012