|
Problem IC63914
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Status: Closed |
UNNECESSARY U LOCK ON CATALOG ROW DURING REFRESH MQT TABLE |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
When a REFRESH TABLE MQT1 statement is executed, U-lock may be
acquired unnecessarily on the catalog rows of other MQTs (call
them MQTi) if all of the following conditions are satisfied:
(1) MQTi shares at least one base table with MQT1
(2) a. MQT1 is an immediate MQT and MQTi is a deferred MQT OR
b. both MQT1 and MQTi are deferred MQTs and the clause
"USING REFRESH DEFERRED TABLES" is not specified in the REFRESH
TABLE statement |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* - *
****************************************************************
* PROBLEM DESCRIPTION: *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 9.7 FP1 or higher *
**************************************************************** |
| Local Fix: |
If both MQT1 and MQTi are deferred MQTs and the clause "USING
REFRESH DEFERRED TABLES" is not specified in the REFRESH TABLE
statement, U lock on MQTi can be avoided by temporarily turning
off routing to deferred MQT before the REFRESH TABLE statement.
For example:
set current refresh age 0;
REFRESH TABLE MQT1;
set current refresh age any; |
| available fix packs: |
DB2 Version 9.7 Fix Pack 1 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 2 for Linux, UNIX, and Windows
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 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 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 10 for Linux, UNIX, and Windows
|
| Solution |
Problem First Fixed in DB2 Version 9.7 Fix Pack 1. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 21.10.2009
08.04.2010
02.02.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.1.FP1,
9.7.FP1
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.1
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