PM12256: DRDA PERFORMANCE IMPROVEMENT USING TCP/IP

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You can track all active APARs for this component.

APAR status

  • Closed as unreproducible in next release.

Error description

  • DB2DDF DDFL09 DB2DRDA DB2TCPIP DB2zIIP
    DRDA performance improvement using TCP/IP.
    **********************************************
    Additional symptoms and keywords:
      ZIIP/K D/T2096 D/T2094 D/T2817 D/T2818
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED: All Distributed Data Facility (DDF) users.   *
    *                 Specifically where remote clients access     *
    *                 DB2 via DRDA over TCP/IP.                    *
    ****************************************************************
    * PROBLEM DESCRIPTION: zIIP related performance improvement    *
    *                      for DRDA over TCP/IP connections from   *
    *                      remote clients.                         *
    ****************************************************************
    * RECOMMENDATION:                                              *
    ****************************************************************
    zIIP related performance improvement for DRDA over TCP/IP
    connections from remote clients.
    

Problem conclusion

Temporary fix

Comments

  • This APAR changes the method used by DB2 for z/OS to control
    the portion of SQL request workloads via DRDA over TCP/IP
    connections ("DRDA workloads") that are authorized to be
    diverted to available zIIP specialty engine(s).  With this
    APAR, IBM has also increased the portion of such DRDA
    workloads that is authorized to run on a zIIP to up to 60%.
    This APAR also provides a performance improvement for the
    processing of such DRDA workloads by reducing processor
    switching overhead for such workloads.
    

APAR Information

  • APAR number

    PM12256

  • Reported component name

    DB2 OS/390 & Z/

  • Reported component ID

    5740XYR00

  • Reported release

    810

  • Status

    CLOSED UR1

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt

  • Submitted date

    2010-04-14

  • Closed date

    2010-05-05

  • Last modified date

    2011-07-21

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

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

    UK56724 UK56725

Modules/Macros

  •    DSNDLCBL DSNLIRTR
    

Fix information

  • Fixed component name

    DB2 OS/390 & Z/

  • Fixed component ID

    5740XYR00

Applicable component levels

  • R810 PSY UK56724

       UP10/05/08 P F005

  • R910 PSY UK56725

       UP10/05/08 P F005

Fix is available

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Document information


More support for:

DB2 for z/OS

Software version:

810

Reference #:

PM12256

Modified date:

2011-07-21

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