|
Problem IC77589
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Status: Closed |
DB2 CAN GENERATE A SUB-OPTIMAL QUERY PLAN FOR A TABLE THAT HAS 0 ROW YET OCCUPIES MANY EMPTY PAGES |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
Sometimes a table can have 0 row yet occupy many empty pages.
This situation can occur if you delete
all rows from a table that originally contained a lot of rows,
and you don't reorg the table afterwards.
DB2 optimizer can generate a sub-optimal query plan when such a
table is involved in a SQL statement. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users of version 9.7 on Linux, Unix and Windows *
* platforms. *
****************************************************************
* PROBLEM DESCRIPTION: *
* Sometimes a table can have 0 row yet occupy many empty *
* pages. This situation can occur if you delete *
* all rows from a table that originally contained a lot of *
* rows, and you don't reorg the table afterwards. *
* DB2 optimizer can generate a sub-optimal query plan when *
* such a table is involved in a SQL statement. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 V97FP5 or higher version *
**************************************************************** |
| Local Fix: |
reorg the table |
| available fix packs: |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
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 |
The APAR was fixed on DB2 V97FP5 and higher version |
| Workaround |
Reorg tables that hold empty pages. |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 18.07.2011
02.01.2012
02.01.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP5
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
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