IC88608: GROWING PACKAGE CACHE WITH INCREASED NUMBER OF STATEMENT ENTRIES ON STATEMENT CONCENTRATOR ENABLED DB.

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • Package cache may be growing with increased number of statement
    entries and decreased numbers of variations if statement
    concentrator is enabled on a database. Performance degradation
    would be observed once package cache becomes full due to the
    increased number of statement entries.
    
    Users can identify if he/she is hitting this problem.
    
    - Statement concentrator is enebled on the databaes. i.e.
    STMT_CONC is set as LITERALS.
    - The number of statement entries in the package cache after
    running FLUSH PACKAGE CACHE keeps growing.
      i.e. the following number keeps growing on the database.
     db2 connect to <dbname>
     db2 flush package cache dynamic
     db2pd -db <dbname> -dyn | grep "^Number of Statements"
    - Small number of variations in comparison with number of
    statements remains in package cache.
    
    This problem is caused by a timing hole on deleting statement
    entries from package cache.
    

Local fix

  • Please set STMT_CONC as OFF.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * Users who use statement concentrator.                        *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Please upgrade to V10.1 FixPack 2 or later.                  *
    ****************************************************************
    

Problem conclusion

  • This problem was first fixed in DB2 V10.1 FixPack 2.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IC88608

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-11-27

  • Closed date

    2012-12-31

  • Last modified date

    2012-12-31

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

    IC82805

  • 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

  • RA10 PSN

       UP



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Document information


More support for:

DB2 for Linux, UNIX and Windows

Software version:

10.1

Reference #:

IC88608

Modified date:

2012-12-31

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