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Informix - Problem description

Problem IT32066 Status: Closed

MULTI TABLE QUERY USING INNER AND LEFT USES A WRONG PATH RESULTING IN POOR
PERFORMANCE

product:
INFORMIX SERVER / 5725A3900 / B70 - IDS 11.70
Problem description:
After upgrading correctly from 11.70.FC8 to 11.70.FC9 the
customer noticed that a certain query was now performing very
badly.

The sqexplain.out showed a very huge estimate and the order of
tables has changed when compared to the previous version.

The fix for APAR IT06403 looks to be the reason for the change
in behaviour.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix 11.70.xC9 and earlier versions.            *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* After upgrading correctly from 11.70.FC8 to 11.70.FC9 it was *
* noticed that a certain query was now performing very         *
* badly.                                                       *
*                                                              *
* The sqexplain.out shows a very huge estimate and the order   *
* of                                                           *
* tables has changed when compared to the previous version.    *
*                                                              *
* The fix for APAR IT06403 looks to be the reason for the      *
* change                                                       *
* in behavior.                                                 *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
04.03.2020
27.08.2020
31.08.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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