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Problem IC85988
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Status: Closed |
IN SMP WHEN DOING DISTINCT OR GROUP BY THAT INCLUDES TIMESTAMP COLUMNS, IT IS POSSIBLE THAT DUPLICATE ROWS WILL BE RETURNED. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
In SMP when doing distinct or group by that includes timestamp
columns, it is possible that duplicate rows will be returned.
example:
select distinct col1(varchar), col2(timestamp) from table
might return duplicate rows if col1 has values that differ in
trailing blanks only. (ex: 'A' and 'A ')
Conditions to encounter this problem:
- must have SMP enabled (database manager config has the
parameter INTRA_PARALLEL set to ON)
- The query degree is > 1 (database config for DFT_DEGREE or the
CURRENT QUERY DEGREE special register)
- must have timestamp column as last column in the list , so it
becomes first column in the hash key
- must have rows that would have been considered identical and
the only difference is varchar column that has spaces |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* SMP only *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Install this fix *
**************************************************************** |
| Local Fix: |
turn SMP off, remove trailing blanks or install this fix. |
| available fix packs: |
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
Install this fix |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 20.08.2012
20.10.2012
20.10.2012 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.7
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