IT00703: QUERY RETURNS INCORRECT RESULTS WITH PDQ ENABLED, OPTOFC=1, FRAGMENTED INDEX SCAN AND SUBQUERY IN MULTIPLE EXECUTIONS

APAR status

• Closed as program error.

Error description

• When a query meets the below requirements, it will return
  incorrect results in multiple executions.
  
  1. Contain a subselect.
  2. Optimizer must choose a fragmented index for the scan.
  3. Enabled PDQ
  4. Enabled OPTOFC (OPTOFC=1)
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All 11.70 users                                              *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * A query may return incorrect results under the following     *
  * conditions:                                                  *
  *  - an index scan is performed on a fragmented index          *
  *  - PDQ is turned on                                          *
  *  - a subquery is used as an index key filter                 *
  *  - the query is executed multiple times, and wrong results   *
  * may occur for subsequent executions                          *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Update to IDS-11.70.xC9                                      *
  ****************************************************************
  

Problem conclusion

• Problem Fixed In IDS-11.70.xC9
  

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:

Fix information

• Fixed component name

  INFORMIX SERVER

• Fixed component ID

  5725A3900

Applicable component levels

• RB70 PSN

     UP