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Problem IT41728
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Status: Closed |
POSSIBLE WRONG RESULTS USING A COMPRESSED INDEX DEPENDING UPON ISOLATION LEVEL
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| product: |
INFORMIX SERVER / 5725A3900 / E10 - |
| Problem description: |
Using a compressed index in this query:
select count (*) from tab1 where col1=number
can lead to wrong results, depending on the isolation level
SET ISOLATION TO COMMITTED READ; SELECT COUNT (*) FROM tab1
WHERE col1 = 12345" | dbaccess test
(count(*))
10979
SET ISOLATION TO DIRTY READ; SELECT COUNT (*) FROM tab1 WHERE
col1 = 12345 | dbaccess test
(count(*))
199061
In this example DIRTY READ produced the wrong result
Uncompressing the index leads to correct results for both
isolation levels. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 14.10.xC9. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 14.10.xC9. *
**************************************************************** |
| Local Fix: |
|
| Solution |
|
| Workaround |
****************************************************************
* USERS AFFECTED: *
* Users of Informix Server prior to 14.10.xC9. *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to Informix Server 14.10.xC9. *
**************************************************************** |
| Comment |
Fixed in Informix Server 14.10.xC9. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 09.08.2022
05.10.2022
05.10.2022 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
