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IT21460: DB2_FMP_COMM_HEAPSZ VALUES GREATER THAN 1GB NOT HONORED

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • If the DB2_FMP_COMM_HEAPSZ is set to greater than 1GB size (
    ~250,000 pages ), its silently set to a value of ~1GB.
    
    In highly concurrent environments where the FMP infrastructure
    is used extensively ( such as Federation ), this can cause "Out
    of memory" errors and subsequent crash of the FMP threads. This
    happens even when the registry var is set to a higher value than
    1GB.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * Even after setting DB2_FMP_COMM_HEAPSZ to a size greater     *
    * than 1GB ( 250,000 pages ) it is silently limited to 1GB.    *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 v111m1fp2                                     *
    ****************************************************************
    

Problem conclusion

  • Fixed in DB2 v111m1fp2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT21460

  • 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

    2017-07-14

  • Closed date

    2018-01-29

  • Last modified date

    2018-01-29

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

    IT10822

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

    IT36093

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:
04 March 2021