IBM Support

IT34104: DB2 QUERY MAY HANG WITH REGISRTY SETTING INJ_DUMMY_PRD4JOIN

Subscribe to this APAR

By subscribing, you receive periodic emails alerting you to the status of the APAR, along with a link to the fix after it becomes available. You can track this item individually or track all items by product.

Notify me when this APAR changes.

Notify me when an APAR for this component changes.

 

APAR status

  • Closed as program error.

Error description

  • Db2 query may hang when the following conditions are met:
    
    -The query has inner join with OR predicate
    -At least one of the OR predicate references only one
    join/subgraph.
    

Local fix

  • Turn the registry off:
    db2set -im DB2_EXTENDED_OPTIMIZATION="INJ_DUMMY_PRD4JOIN OFF"
    
    or apply the above using optimizer guidelines as
    
    <query>
    
    /*
    <OPTGUIDELINES>
    <REGISTRY>
    <OPTION NAME='DB2_EXTENDED_OPTIMIZATION'
    VALUE='INJ_DUMMY_PRD4JOIN OFF'/>
    </REGISTRY>
    </OPTGUIDELINES>*/ ;
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * DB2 V11.1.4                                                  *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * none                                                         *
    ****************************************************************
    

Problem conclusion

Temporary fix

Comments

APAR Information

  • APAR number

    IT34104

  • 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

    2020-09-03

  • Closed date

    2021-03-15

  • Last modified date

    2021-03-15

  • 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

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

Document Information

Modified date:
16 March 2021