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IT24811: STEPPING TQS MAY EXPERIENCE A HANG IN SITUATIONS WHEN WE ARE TRYING TO STOP TQ DRAINING AS A PERFORMANCE OPTIMIZATION.

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APAR status

  • Closed as program error.

Error description

  • Stepping TQs may experience a hang in situations when we are
    trying to stop TQ draining as a performance optimization.
    
    This may result in a application/agent hang issue on this SQL
    statement.
    
    The stacks for this applciation may look similar to the
    following:
    
    thread_wait
    sqloWaitEDUWaitPost
    WaitRecvReady
    ReceiveBuffer
    sqlkq_process_ctl_msg
    sqlktins
    sqlritqb
    sqlriSectInvoke
    sqlrr_smp_router
    
    And
    
    thread_wait
    sqloWaitEDUWaitPost
    WaitRecvReady
    ReceiveBuffer
    getNextBuffer
    sqlkd_rcv_buffer
    sqlkd_rcv_get_next_buffer
    sqlkd_rcv_init
    sqlkdReceiveReply
    sqleReceiveAndMergeReplies
    sqlrigca
    sqlrices
    
    </StackTrace>
    

Local fix

  • db2set DB2_RUNTIME_DEBUG_FLAGS=40000000
    <instance restart>
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1 Mod 4 Fixpack 4 or higher                *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 4
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT24811

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2018-04-23

  • Closed date

    2018-11-27

  • Last modified date

    2018-11-27

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

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

    IT24830

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • RB10 PSN

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
27 November 2018