IT04085: WRONG RESULTS RECEIVED FOR A QUERY DUE TO INCORRECT INTERNAL COLUMN STRUCTURES

DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• The wrong result set may be outputted if the Optimizer chooses
  an Explain Plan with the following characteristics:
  - HSJN has an NLJN in the Outer
  - The NLJN has another HSJN in it's Inner
  - The second, HSJN also has an NLJN in it's Outer:
  
                                                 HSJN( A)
                                                       |
              ---------------------------------------------------
             |
          NLJN(B)
        /           \
                   <   other Lolepops like TEMP, etc>
                     |
                  HSJN(C)
                     |
            ------------------
           |
         NLJN(D)
  
  In a rare case, internal Optimization could create wrong
  internal structures and the Column coming from HSJN(C) Payload
  could return the same value as the last value that was processed
  in HSJN(C).
  

Local fix

• To avoid the problem, execute the following command and then
  recycle the instance:
  db2set DB2_TCG_DEFAULT_OPTIONS="set disable_pushdown on"
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All users                                                    *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to DB2 version 10.1.0.5.                             *
  ****************************************************************
  

Problem conclusion

• The problem is first fixed in DB2 version 10.1.0.5.
  

Temporary fix

Comments

APAR Information

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

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

  IT05898

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RA10 PSN

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