PM60732: INSERT SPACE SEARCH ENHANCEMENT, USING PREFETCH TO SCAN SPACE MAP PAGES DURING EXHAUSTIVE SEARCH

A fix is available

Subscribe

You can track all active APARs for this component.

APAR status

  • Closed as unreproducible in next release.

Error description

  • INSERT performance is bad when an exhaustive search occurs, many
    getpages and SYNC IOs are made on space map pages.
    

Local fix

  • Avoid frequently dataset extent by using large PRIQTY/SECQTY.
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All DB2 9 for z/OS users                     *
    *                 All DB2 10 for z/OS users                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: Index space map search for free page    *
    *                      during index page split takes a long    *
    *                      time for large indexes and causes       *
    *                      time-outs.                              *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    DB2 attempts to avoid the cost of an index pageset extend by
    first searching all index space map pages for a free page
    during index page split. This exhaustive search may take a long
    time for large indexes and cause time-outs.
    
    Additional Keywords: MSGDSNT501I RC00C20255
    

Problem conclusion

Temporary fix

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

Comments

  • The index space map search algorithm has been enhanced to
    utilize page list prefetch for faster search processing. By
    reducing the amount of time needed to perform exhaustive space
    map searches, this enhancement may reduce the number of
    time-outs caused by index space map searches.
    

APAR Information

  • APAR number

    PM60732

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    910

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2012-03-19

  • Closed date

    2012-05-11

  • Last modified date

    2012-06-03

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

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

    UK78678 UK78679

Modules/Macros

  •    DSNKSALO
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • RA10 PSY UK78678

       UP12/05/26 P F205

  • R910 PSY UK78679

       UP12/05/26 P F205

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.



Rate this page:

(0 users)Average rating

Add comments

Document information


More support for:

DB2 for z/OS

Software version:

910

Reference #:

PM60732

Modified date:

2012-06-03

Translate my page

Machine Translation

Content navigation