|
Problem IC68255
|
Status: Closed |
LONG COMPILE TIME FOR QUERIES INVOLVING NULL TOLERANT JOIN PREDICATES. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
You might experience long compile time for queries
involving one or more null tolerant join predicates.
This type of predicate is in the form of
T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL) |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* You might experience long compile time for queries *
* *
* involving one or more null tolerant join predicates. *
* *
* This type of predicate is in the form of *
* *
* *
* *
* T1.A=T2.A or (T1.A IS NULL and T2.A IS NULL) *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 version 9.7 Fix Pack 3 and set *
* DB2_REDUCED_OPTIMIZATION=NOSORT_NEQN to enable a reduced *
* optimization strategy targeted to null tolerant join *
* predicates. *
**************************************************************** |
| Local Fix: |
Reducing the query optimization level might reduce the compile
time. |
| available fix packs: |
DB2 Version 9.7 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 4 for Linux, UNIX, and Windows
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 problem was first fixed in Version 9.7 Fix Pack 3. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 28.04.2010
20.09.2010
20.09.2010 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP3
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.3
|
 |
| 9.7.0.3
|
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