PK67554: DB2 DOES NOT CONSIDER VIRTUAL INDEXES FOR QUERIES INVOLVING A VIEW

Obtain the fix for this APAR.

APAR status

• Closed as program error.

Error description

• Virtual indexes do not appear in the PLAN_TABLE after Explain
  of a query involving a view.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED: All users of DB2 Explain.                    *
  ****************************************************************
  * PROBLEM DESCRIPTION: Indexes in DSN_VIRTUAL_INDEXES are      *
  *                      not used in EXPLAIN for a statement     *
  *                      with views under certain conditions.    *
  ****************************************************************
  * RECOMMENDATION:                                              *
  ****************************************************************
  Indexes in DSN_VIRTUAL_INDEXES may not be used in EXPLAIN
  for a statement with views.  If the virtual index is created as
  an actual index, EXPLAIN will show that the actual index is
  used in PLAN_TABLE.
  
  For DB2 R810, indexes in DSN_VIRTUAL_INDEXES are not used in
  EXPLAIN for a statement when all of the following apply:
   (1) The index(es) in DSN_VIRTUAL_INDEXES are on a base table
       with a view reference.
   (2) The view in the SQL statement being explained meets any
       one of the following conditions:
       (a) The view refers to special registers
           USER or CURRENT SQLID.
       (b) The view is created before V8 New Function Mode.
       (c) The view has to be regenerated. Conditions for view
           regeneration are listed in the SQL Reference for
           ALTER TABLE in Table 71.
  
  For DB2 R910, indexes in DSN_VIRTUAL_INDEXES are not used in
  EXPLAIN for a statement when the index(es) in
  DSN_VIRTUAL_INDEXES are on a base table with a view reference.
  
  Keywords:
  EXPLAIN DSN_VIRTUAL_INDEX DSN_VIRTUAL_INDEXES
  OPTIMIZATION EXPERT INDEX ADVISOR
  

Problem conclusion

• Code has been fixed so that indexes in DSN_VIRTUAL_INDEXES are
  used in EXPLAIN for a statement with views.
  

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:

  UK38414 UK38413

Modules/Macros

• DSNXOADT DSNXOTL
  

Fix information

• Fixed component name

  DB2 OS/390 & Z/

• Fixed component ID

  5740XYR00

Applicable component levels

• R810 PSY UK38413

     UP08/08/11 P F808

• R910 PSY UK38414

     UP08/08/11 P F808

Fix is available

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