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IT18083: WRONG RESULTS AGAINST COLUMN ORGANIZED TABLE ARE POSSIBLE WITH EXPANDING JOIN PLAN

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APAR status

  • Closed as program error.

Error description

  • WRONG RESULTS AGAINST COLUMN ORGANIZED TABLE ARE POSSIBLE WITH
    EXPANDING JOIN PLAN, if
    -  Join is between 3 or more column organized tables, using
    equality predicates
    - top most join in the plan is happening on a variable string
    value and we do find and strip trailing blanks as part of
    normalization processing in preparation for join
    
    Example:
    
    	3) HSJOIN: (Hash Join)
    		Cumulative Total Cost: 		58882.1
    		Cumulative CPU Cost: 		8.86042e+08
    		Cumulative I/O Cost: 		11664
    		Cumulative Re-Total Cost: 	58882.1
    		Cumulative Re-CPU Cost: 	8.86042e+08
    		Cumulative Re-I/O Cost: 	11664
    		Cumulative First Row Cost: 	58882.1
    		Estimated Bufferpool Buffers: 	181
    
    		Arguments:
    		---------
    		EARLYOUT: (Early Out flag)
    			NONE
    		SEMIJOIN: (Semi-join flag)
    			FALSE
    
    		Predicates:
    		----------
    		5) Predicate used in Join,
    			Comparison Operator: 		Equal (=)
    			Subquery Input Required: 	No
    			Filter Factor: 			7.87278e-05
    
    			Predicate Text:
    			--------------
    			(VARCHAR(Q2.COLUMN1, 12) = Q3.COLUMN2)
    

Local fix

  • Please, install this fix
    

Problem summary

  • ****************************************************************
    * USERS AFFECTED:                                              *
    * ALL                                                          *
    ****************************************************************
    * PROBLEM DESCRIPTION:                                         *
    * See Error Description                                        *
    ****************************************************************
    * RECOMMENDATION:                                              *
    * Upgrade to DB2 11.1 Mod 2 Fix Pack 2 or higher               *
    ****************************************************************
    

Problem conclusion

  • First fixed in DB2 11.1 Mod 2 Fix Pack 2
    

Temporary fix

Comments

APAR Information

  • APAR number

    IT18083

  • Reported component name

    DB2 FOR LUW

  • Reported component ID

    DB2FORLUW

  • Reported release

    B10

  • Status

    CLOSED PER

  • PE

    NoPE

  • HIPER

    YesHIPER

  • Special Attention

    NoSpecatt / Xsystem

  • Submitted date

    2016-11-22

  • Closed date

    2017-06-23

  • Last modified date

    2017-06-23

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

    IT17679

  • 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

[{"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","Line of Business":{"code":"LOB10","label":"Data and AI"}}]

Document Information

Modified date:
29 June 2020