IC96012: POTENTIAL HANG ON TRANENTRY LATCH IN SQLPM_WRITE_APPL_LOCKS DURING LOCK SNAPSHOT

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • When a federated server utilizing two-phase-commit starts up it
    will hold the tranEntry latch.  If the federated query involves
    connecting back into the same database then it will start an
    agent that will try to get the dblatch.
    
    Since snapshot processing first gets the dblatch and then tries
    to get the tranEntry latch, it is possible for a hang to occur
    if a LOCK snapshot is processing when such federated query
    processing is running.
    

Local fix

  • This hang can be avoided if the federated transaction does not
    require two phase commit. Two phase commit can be disabled as
    follows:
    
    alter server <server name> options (set DB2_TWO_PHASE_COMMIT
    'N')
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Anybody using federated transaction two phase commit         *
    * transaction and LOCK snapshots                               *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Version 9.7 Fix Pack 9                            *
    ****************************************************************
    

Problem conclusion

  • Problem was first fixed in Version 9.7 Fix Pack 9
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC96012

  • 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

    2013-09-17

  • Closed date

    2013-12-16

  • Last modified date

    2013-12-16

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

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

    IC96022 IC96028 IC96535

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

9.7

Reference #:

IC96012

Modified date:

2013-12-16

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