PM63505: IMPROVE PERFORMANCE OF RESTORE SYSTEM UTILITY

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You can track all active APARs for this component.

APAR status

  • Closed as program error.

Error description

  • RESTORE SYSTEM performance needs to improve performance during
    log apply phase.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 9 for z/OS users of the DB2 Restore  *
    *                 System utility.                              *
    ****************************************************************
    * PROBLEM DESCRIPTION: IMPROVE PERFORMANCE OF RESTORE SYSTEM   *
    *                      LOG APPLY.                              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    During Restore System log apply phase, after processing each
    Fast Log Apply (FLA) buffer for each object, data changes are
    externalized. Writing out data changes to DASD could take up to
    several seconds for each object depending on the number of pages
    to be written out. Also, at the end of Restore System, all the
    objects accessed during log apply phase are physically closed.
    Physical close could take up several minutes depending on number
    of objects involved in the recovery. To improve performance this
    APAR will avoid externalizing data pages at the end of every FLA
    buffer and avoid physically closing of all data sets until after
    the restore system is completed.
    

Problem conclusion

  • Restore system  logic is modified to improve performance of log
    apply by deferring the physical close of objects after the
    restore system is completed.
    

Temporary fix

  • *********
    * HIPER *
    *********
    

Comments

APAR Information

  • APAR number

    PM63505

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    910

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-04-27

  • Closed date

    2012-05-05

  • Last modified date

    2012-07-02

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

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

    UK78910

Modules/Macros

  •    DSNILOGA DSNIRSTR
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • R910 PSY UK78910

       UP12/06/05 P F206

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:

910

Reference #:

PM63505

Modified date:

2012-07-02

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