IC98433: OPTIMIZER CHOOSED SEQUENTIAL SCAN FOR QUERY WITH LVARCHAR, WITH VARCHAR OPTIMIZER CHOOSES INDEX PATH

APAR status

• Closed as program error.

Error description

• The optimizer will choose a sequential scan for a query
  containing an LVARCHAR data type.  The optimizer chooses an
  index path for the same query with a VARCHAR data type.
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All 11.70 users.                                             *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * A query may have sub-optimal query plan under the following  *
  * conditions:                                                  *
  *   - query has an equality predicate on LVARCHAR column, e.g. *
  * col1 = "abcd" where col1 is defined as LVARCHAR              *
  *   - there exists an index with col1 as the leading index     *
  * column                                                       *
  *   - update statistics has been run on the table              *
  ****************************************************************
  * 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