IBM Support

IT28059: PERFORMANCE ISSUE SEEN ON HADR ROS WITH ONLY ONE BUFFERPOOL

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APAR status

  • Closed as program error.

Error description

  • 100% CPU spikes on the Reads On Standby database server of a
    HADR cluster.  Performance issue is caused by dropping temporary
    tables in the read-only workloads on the HADR active standby
    database with only one bufferpool. No issue seen on primary.
    Difference is a result of Db2 treating temporary and regular
    tables the same way on the standby.
    

Local fix

  • Create additional bufferpools for TEMPSPACE1 and
    SYSTOOLSTMPSPACE.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 11.1 Mod 4 Fixpack 5 or higher                *
    ****************************************************************
    

Problem conclusion

  • First fixed in Db2 11.1 Mod 4 Fixpack 5
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT28059

  • 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

    2019-02-11

  • Closed date

    2020-01-16

  • Last modified date

    2020-01-16

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

    IT28058

  • 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

  • RB10 PSN

       UP

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Document Information

Modified date:
16 January 2020