IBM Support

IT34787: MON_UOW_EXECLIST CONSUMES MONHEAP EVEN WHEN OFF

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APAR status

  • Closed as program error.

Error description

  • When the MON_UOW_EXECLIST database configuration parameter is
    set to OFF every Db2 application will still consume monitor heap
    relating to Executable ID list collection.  This could result in
    other processing failing to get monitor heap.  This in turn
    could lead to a FODC_Memory diagnostic collection.  Here is a
    sample stack that shows other processing failing to get monitor
    heap:
    fd_select
    sqloReadNamedPipe
    sqloReadVendorRC
    sqloInvokeVendorFunction
    pdVendorCallWrapper
    pdInvokeCalloutScriptViaVendorAPI
    dumpOnOOM
    sqloMemLogPoolConditions
    sqloGetMemoryBlockExtended
    GetFastWriterRecord
    collectRequestorActivities
    collectLockEvent
    sqlplWaitOnWP
    sqlplMakeNewRequestNonSD
    sqlplrq
    sqliLockUncond
    sqliLockForReadUncond
    sqli_proc_leaf
    sqlischf
    sqlirdk
    sqldIndexFetch
    sqldRowFetch
    sqlriFetch
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * all                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1.4.6 or higher                            *
    ****************************************************************
    

Problem conclusion

  • Upgrade to Db2 11.1.4.6 or higher
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT34787

  • 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

    2020-11-04

  • Closed date

    2021-03-31

  • Last modified date

    2021-03-31

  • 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

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

Document Information

Modified date:
01 April 2021