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Latest versionsfixlist
14.10.xC5 FixList
12.10.xC14.X5 FixList
11.70.xC9.XB FixList
11.50.xC9.X2 FixList
11.10.xC3.W5 FixList
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Informix - Problem description

Problem IT30036 Status: Closed

12.10 SERVER GENERATES SLOW ANSI JOIN QUERY PLAN COMPARING WITH 11.50

product:
INFORMIX SERVER / 5725A3900 / C10 - IDS 12.10
Problem description:
12.10 server generates slow ANSI join query plan comparing with
11.50.

Selectivity varies if distributions are present or not.

Related to table reordering with ANSI JOINs. If SQL_FEAT_CTRL2
bit 0x4 DISABLE_LVL0_REORDER to disable idsdb00505160 is set
then behavior resembles 11.50
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of IDS prior to 12.10.xC13.                            *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* 12.10 server generates slow ANSI join query plan compared to *
* 11.50.                                                       *
****************************************************************
* RECOMMENDATION:                                              *
****************************************************************
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
19.08.2019
03.10.2019
03.10.2019
Problem solved at the following versions (IBM BugInfos)
12.10.xC13
Problem solved according to the fixlist(s) of the following version(s)
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