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IT03500: LOW PERFORMANCE OF QUERIES ON ADMSINTABINFO

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Queries on ADMSINTABINFO are slow even if all TCBs are loaded in
    memory already.
    
    I set DBHEAP to 40000, should be able to store 20000 tables' TCB
    info, actually about 10000 tables in that db.
    Check with "db2pd -db testdb -tcb" to make sure all tables TCB
    was in DBHEAP.
    
    time db2 "select tabname from sysibmadm.admintabinfo where
    reorg_pending='Y'"
    
    TABNAME
    ----------------------------------------------------------------
    ----------------------------------------------------------------
    ADMIN99
    ADMIN999
    
      2 record(s) selected.
    
    real    2m48.74s
    user    0m0.01s
    sys     0m0.01s
    
    I still saw bufferpool data read as below
    
    Buffer pool data logical reads             = 337188
    Buffer pool data physical reads            = 323543
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All DB2 V9.7 users.                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 V9.7 Fix Pack 11 or higher.                   *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 V9.7 Fix Pack 11.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT03500

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    970

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2014-07-31

  • Closed date

    2015-10-13

  • Last modified date

    2015-10-13

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

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

    IT04356 IT04358

Fix information

  • Fixed component name

    DB2 FOR LUW

  • Fixed component ID

    DB2FORLUW

Applicable component levels

  • R970 PSN

       UP



Document information

More support for: DB2 for Linux, UNIX and Windows

Software version: 9.7

Reference #: IT03500

Modified date: 13 October 2015