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DB2 - Problem description

Problem IC73341 Status: Closed

BACKUP PERFORMANCE DEGRADATION UPGRADING TO 9.1 FP8+ FROM 9.1 FP7

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
Backup Performance may degrade after applying 9.1 Fix Pack 8 or 
greater when executing the Backup command without explicitly 
specifying the Parallelism and Buffer Values and when letting 
DB2 automatically compute the values. 
 
Automatic values chosen by DB2 when no parallelism or buffer 
size is explicitly chosen is lower in FP8+ compared to FP7. 
 
For example, In one case: 
Fix Pack "7" : 
 
Autonomic backup/restore - using parallelism = 12. 
 
Using buffer size = 3328, number = 24 
 
 
 
 
Fixpak "9" : 
 
Autonomic backup/restore - using parallelism = 2. 
 
Using buffer size = 4096, number = 4.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All users running backup and choosing defaults by DB2 for    * 
* parallelism and buffer size parameters.                      * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* Backup Performance may degrade after upgrading to 9.1 FP8+   * 
* from 9.1 FP7                                                 * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Please upgrade to Fix pack 11 or greater containing the fix  * 
****************************************************************
Local Fix:
Run the Backup command specifying explicit values for 
Parallelism and Buffer Size.
available fix packs:
DB2 Version 9.1 Fix Pack 11  for Linux, UNIX and Windows
DB2 Version 9.1 Fix Pack 12  for Linux, UNIX and Windows

Solution
Please upgrade to a Fix pack containing the fix
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC78936 IC78937 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
16.12.2010
13.12.2011
13.12.2011
Problem solved at the following versions (IBM BugInfos)
Problem solved according to the fixlist(s) of the following version(s)
9.1.0.11 FixList
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