|
Problem IC65405
|
Status: Geschlossen |
POSSIBLE PERFORMANCE REGRESSION FROM SCALAR SUBQUERY PUSH DOWN INTO OUTER JOIN |
| Produkt: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problembeschreibung: |
A SQL staement containing a scalar subquery used in the context
of >=, >, <=, <, !=, or as an expression of other expression
rather than an equality predicate may be pushed down under an
Outer Join operation. If the whole expression results in an
expanding join because of the push down, it could potentially
degrade the performance of the statement. |
| Problem-Zusammenfassung: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* A SQL statement containing a scalar subquery used in the *
* context *
* of >=, >, <=, <, !=, or as an expression of other expression *
* *
* rather than an equality predicate may be pushed down under *
* an *
* Outer Join operation. If the whole expression results in an *
* *
* expanding join because of the push down, it could *
* potentially *
* degrade the performance of the statement. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 9.5 Fix Pack 6 *
**************************************************************** |
| Local-Fix: |
Upgraded to DB2 Version 9.1 Fix Pack 9 |
| 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 Fix Pack 6 |
| Workaround |
keiner bekannt / siehe Local-Fix |
| Weitere Daten |
Datum - Problem gemeldet :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
| 05.01.2010
17.05.2010
17.05.2010 |
| Problem behoben ab folgender Versionen (IBM BugInfos) |
9.5.FP6
|
| Problem behoben lt. FixList in der Version |
