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IT22684: SQL STATEMENTS EXECUTING AN INDEX SCAN WITH INTRA-PARTITION PARALLELISM ENABLED MIGHT RUN SLOW

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You can track all active APARs for this component.

 

APAR status

  • Closed as program error.

Error description

  • SQL statements executing an index scan with intra-partition
    parallelism enabled might run slower than necessary in Db2
    version 11.1.2.2.  This only happens when an exclusive start key
    is specified such that the key does not exist in the index and
    is greater than or smaller than all the keys in the index.
    
    If db2trc is used to capture information about the SQL
    statement, it will show that the entire scan is being performed
    by a single sub-agent.  The other sub-agents will call
    sqliGetNxtRng and get SQLI_EOF.
    

Local fix

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * All users running on Db2 version 11.1.2.2 with               *
    * intra-partition parallelism enabled.                         *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to Db2 version 11.1.3.3.                             *
    ****************************************************************
    

Problem conclusion

  • The problem is first fixed in Db2 version 11.1.3.3.
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT22684

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    NoHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2017-10-05

  • Closed date

    2018-03-15

  • Last modified date

    2018-03-15

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

  • 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

  • RB10 PSN

       UP

[{"Business Unit":{"code":"BU053","label":"Cloud & Data Platform"},"Product":{"code":"SSEPGG","label":"Db2 for Linux, UNIX and Windows"},"Component":"","ARM Category":[],"Platform":[{"code":"PF025","label":"Platform Independent"}],"Version":"11.1","Edition":"","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
15 March 2018