|
Problem IC66440
|
Status: Geschlossen |
STATEMENT COMPILATION MAY FAIL TO USE THE STATISTICS COLLECTED FOR A GLOBAL TEMPORARY TABLE. |
| Produkt: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problembeschreibung: |
In some situations, statement compilation may fail to use the
statistics collected for a global temporary table. This may
lead to a non optimal access plan. For example, in the sequence
of:
1. declare global temporary table
2. insert data into the global temporary table
3. runstats on the global temporary
4. use the global temporary table in a query
the statement compilation in step4 may not use the statistics
collected in step3. |
| Problem-Zusammenfassung: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* In some situations, statement compilation may fail to *
* usethestatistics collected for a global temporary table. *
* This maylead to a non optimal access plan. For example, in *
* thesequenceof:1. declare global temporary table2. insert *
* data into the global temporary table3. runstats on the *
* global temporary4. use the global temporary table in a *
* querythe statement compilation in step4 may not use *
* thestatisticscollected in step3. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 version 9.5 FP6 *
**************************************************************** |
| Local-Fix: |
- After observing the problem, repeating the RUNSTATS operation
typically clears the problem.
- Querying the global temporary table prior to the RUNSTATS
operation, for example with "select 1 from session.t1 fetch
first 1 row only", typically avoids the problem. |
| verfügbare FixPacks: |
DB2 Version 9.5 Fix Pack 6a for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows
|
| Lösung |
First fixed in DB2 version 9.5 FP6 |
| Workaround |
keiner bekannt / siehe Local-Fix |
| Bug-Verfolgung |
Vorgänger : APAR is sysrouted TO one or more of the following: IC66441 IC66442 IC66443
Nachfolger : |
| Weitere Daten |
Datum - Problem gemeldet :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
| 18.02.2010
14.06.2010
14.06.2010 |
| Problem behoben ab folgender Versionen (IBM BugInfos) |
9.5.FP6
|
| Problem behoben lt. FixList in der Version |
