DB2 FOR LUW / DB2FORLUW / 970 - DB2

Concurrent access to the DB2 recovery history file is currently 
accomplished by using operating system semaphore primitives - 
semop() calls. 
Two different potential problem areas were identified when 
accessing/locking the history file in parallel via it's 
several API's: 
 
1) Frequent semop() calls may cause performance issues (high 
   CPU usage) especially if the history file is very large. 
 
2) There is a small timing window where DB2 may hang when 
   a process is killed while initializing the semaphore. 
 
The fix for this APAR will ensure that the above problems are 
avoided by redesigning the internal locking mechanism used by 
DB2.

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* USERS AFFECTED:                                              * 
* all version 9                                                * 
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* PROBLEM DESCRIPTION:                                         * 
* see error description above                                  * 
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* RECOMMENDATION:                                              * 
* Upgrade to Version 9.7 Fix Pack 2                            * 
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Avoid frequent parallel access to the recovery history file. 
 
and/or 
 
try to prune the recovery history file on regular intervals to 
keep it's size small.

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 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 9a 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
 

Problem was first fixed in Version 9.7 Fix Pack 2

keiner bekannt / siehe Local-Fix

Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:

25.01.2010
14.12.2010
14.12.2010

9.7.FP2