Latest versionsfixlist
11.1.0.7 FixList
10.5.0.9 FixList
10.1.0.6 FixList
9.8.0.5 FixList
9.7.0.11 FixList
9.5.0.10 FixList
9.1.0.12 FixList
Have problems? - contact us.
Register for free anmeldung-x26
Contact form kontakt-x26

DB2 - Problem description

Problem IC80931 Status: Closed

DB2 INSTANCE MAY CRASH WHEN REMOVING TAUTOLOGY PREDICATES DURING QUERY
REWRITE

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
There is a component in DB2 compiler called Query ReWrite (QRW) 
which rewrites the customer queries 
to improve performance. 
 
One of the rewrites performed is removal of tautology 
predicates. 
Under rare scenarios, DB2 may trap with SIGSEGV (Signal #11) 
while trying to remove these predicates. 
 
Conditions for hitting the problem: 
1. The query involves one or more of tautology predicates 
2. The columns involved in the predicates in 1, are also part of 
generated column definition. 
 
 
The following stack trace will be reported in the trap file: 
 
5        sqlnr_remove_tautology_prd 
6        sqlnr_optprep 
7        sqlnr_optprep_action 
8        sqlnr_comp 
9        sqlnr_seq 
10       sqlnr_rcc 
11       sqlnr_exe 
12       sqlnn_cmpl 
13       sqlnn_cmpl
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Please upgrade to DB2 version 970 fixpack 6                  * 
****************************************************************
Local Fix:
N/A
available fix packs:
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 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
Problem is fixed in DB2 version 970 fixpack 6
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC84287 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
20.01.2012
06.06.2012
06.06.2012
Problem solved at the following versions (IBM BugInfos)
9.7.0
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.6 FixList
This site uses cookies to make it easier for us to provide you with our services. By using our site you agree to the use of cookies.