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Problem IC83590
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Status: Closed |
Latch contention issue in XML pathID cache could have cause performance issue. |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
Performance could have been impacted if there are many
activities on XML pathID cache. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users of V9.7 *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Move to the latest fix pack. *
**************************************************************** |
| Local Fix: |
Introduce hash table for XML pathID cache to reduce the latch
contention.
db2set DB2_COMPILER_XML_OVERRIDES=00000000000000000000n
where n can be 1 to 9
db2stop force
db2start
The number n represents the power of 2 size of the hash table
cache (as an example, if n = 7, it will have 128 hash buckets
for the XML pathID cache). |
| available fix packs: |
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 |
Introduce hash table for XML pathID cache to reduce the latch
contention. |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC87881
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 18.05.2012
10.12.2012
10.12.2012 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.7
|
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