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Problem IC74013
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Status: Geschlossen |
FILTER FACTOR OVERESTIMATION WHEN INLIST PREDICATE WITH MULTIPLE PARAMETER MARKERS AND THE COLUMN HAS MANY NULLS |
| Produkt: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problembeschreibung: |
We may overestimate the filter factor when we have an INLIST
predicate with multiple parameter markers/host variables and the
column has significant number of NULLs. This can lead to a
sub-optimal access plan. |
| Problem-Zusammenfassung: |
****************************************************************
* USERS AFFECTED: *
* Users running queries with multiple parameter markers with *
* an inlist against a table with many nulls *
****************************************************************
* PROBLEM DESCRIPTION: *
* We may overestimate the filter factor when we have an INLIST *
* predicate with multiple parameter markers/host variables and *
* the column has significant number of NULLs. This can lead *
* to a sub-optimal access plan. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v9.7 FP5 or newer *
**************************************************************** |
| Local-Fix: |
Contact DB2 Support |
| verfügbare FixPacks: |
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
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| Lösung |
Upgrade to DB2 v9.7 FP5 or newer |
| Workaround |
keiner bekannt / siehe Local-Fix |
| Bug-Verfolgung |
Vorgänger : APAR is sysrouted TO one or more of the following: IC74035
Nachfolger : |
| Weitere Daten |
Datum - Problem gemeldet :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
| 20.01.2011
21.12.2011
21.12.2011 |
| Problem behoben ab folgender Versionen (IBM BugInfos) |
9.7.FP5
|
| Problem behoben lt. FixList in der Version |
| 9.7.0.5
|
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