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DB2 - Problem description

Problem IC78936 Status: Closed

BACKUP PERFORMANCE DEGRADATION UPGRADING TO 9.5 FP5+

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
Backup Performance may degrade after applying 9.5 Fix Pack 5 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 FP5+ compared to FP4. 
 
For example, In one case: 
Fix Pack "4" : 
 
Autonomic backup/restore - using parallelism = 12. 
 
Using buffer size = 3328, number = 24 
 
 
 
 
Fixpak "5" : 
 
Autonomic backup/restore - using parallelism = 2. 
 
Using buffer size = 4096, number = 4.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All DB2 Users running Backup with default parallelism and    * 
* buffer values                                                * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* see above                                                    * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.5 Fix Pack 9 or higher              * 
****************************************************************
Local Fix:
Run the Backup command specifying explicit values for 
Parallelism and Buffer Size.
available fix packs:
DB2 Version 9.5 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.5 Fix Pack 10 for Linux, UNIX, and Windows

Solution
Problem first fixed in DB2 Version 9.5 Fix Pack 9
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
27.09.2011
12.03.2012
12.03.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP9
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.9 FixList
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