IBM Support

IT31708: LOB PAGES MAY NOT BE REUSED PROPERLY IN PURESCALE.

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APAR status

  • Closed as program error.

Error description

  • In pureScale environment, page reuse for LOBs is governed by
    internal readLSN. A deleted page can only be reused when the
    following are true: (a) delete is committed; (b) all readers
    that accessed the the page prior to deletion have been
    committed.
    
    If table function ADMIN_GET_TAB_INFO or ADMINTABINFO
    administrative view were called on a member that hasn't acceseed
    the <TARGET_TABLE>, this would cause this member to hold back
    the internal readLSN value for this <TARGET_TABLE>. This will
    cause db2 to not reuse the deleted pages of <TARGET_TABLE>
    properly even though the page is no longer in use.
    

Local fix

  • Simply issue "SELECT * FROM <TARGET_TABLE> LIMIT 1" on every
    member. This will help refresh the global internal readLSN.
    Use above as temporary workarounds and contact IBM DB2 Support.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to fixpack inclusive of this APAR fix.               *
    ****************************************************************
    

Problem conclusion

  • See APAR description
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT31708

  • 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

    2020-01-30

  • Closed date

    2021-02-20

  • Last modified date

    2021-02-20

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

    IT31697

  • 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:
27 February 2021