PM70981: ADD DB2 BUFFER POOL STATISTICS COUNTERS TO IMPROVE ANALYSIS FOR PERFORMANCE ISSUES

A fix is available

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APAR status

  • Closed as program error.

Error description

  • Changes to add three new buffer pool statistics counters to
    improve serviceability when analyzing DB2 performance issues.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 users.                               *
    ****************************************************************
    * PROBLEM DESCRIPTION: Added new buffer pool statistics.       *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    New buffer pool statistics are added to help with
    performance analysis related to the buffers on the
    sequential least-recently-used (SLRU) chain.
    

Problem conclusion

  • MSGDSNB411I for the -DISPLAY BUFFERPOOL(bufferpool_id) DETAIL
    has been modified to include the following:
    SEQUENTIAL - Number of buffers on the SLRU chain
    VPSEQT HIT - Number of times that the size of the SLRU chain
                 reaches the VPSEQT for the buffer pool
    RECLASSIFY - A statistic that is used by IBM for serviceability
    
    The following fields are introduced in the IFCID 2 trace:
    1. QBSTSMIN
       Minimum number of buffers on the SLRU chain within a
       statistic interval.
    2. QBSTSMAX
       Maximum number of buffers on the SLRU chain within a
       statistic interval.
    3. QBSTHST
       Number of times that the size of the SLRU chain reaches the
       VPSEQT.
    4. QBSTRHS
       A statistic that is used by IBM for serviceability.
    

Temporary fix

Comments

  • ž**** PE13/08/07 FIX IN ERROR. SEE APAR PM94435  FOR DESCRIPTION
    

APAR Information

  • APAR number

    PM70981

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    A10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-08-15

  • Closed date

    2013-05-06

  • Last modified date

    2013-08-19

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

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

    UK94096

Modules/Macros

  •    DSNB1BVP DSNB1CBP DSNB1DBP DSNB1DVP DSNB1GET
    DSNB1GWB DSNB1LRR DSNB1REL DSNB1RWI DSNB1TSD DSNDQBST DSNFBDIR
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK94096

       UP13/05/22 P F305

Fix is available

  • Select the PTF appropriate for your component level. You will be required to sign in. Distribution on physical media is not available in all countries.



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Document information


More support for:

DB2 for z/OS

Software version:

A10

Reference #:

PM70981

Modified date:

2013-08-19

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