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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 IT32496 Status: Closed

SELECT WITH SORT IS SLOWER BECAUSE IT IS USING SEQUENTIAL SCAN EVEN IF
INDEX EXISTS

product:
INFORMIX SERVER / 5725A3900 / E10 - 
Problem description:
A query such as:

SELECT * FROM tab1 ... ORDER BY c1

may use sequential scan even if index for c1 exists and may be
slower because it has to sort the resulting rows.
Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
* Users of Informix Server prior to 14.10.xC5.                 *
****************************************************************
* PROBLEM DESCRIPTION:                                         *
* See Error Description                                        *
****************************************************************
* RECOMMENDATION:                                              *
* Update to Informix Server 14.10.xC5.                         *
****************************************************************
The fix can be disabled by turning on 0x10000 in SQL_FEAT_CTRL2:

onmode -wm SQL_FEAT_CTRL2=0x10000

NOTE: first find the current setting for SQL_FEAT_CTRL2 and then
add 0x10000 to that value in command above.
Local Fix:
Solution
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
08.04.2020
06.12.2020
06.12.2020
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
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