|
Problem IC75399
|
Status: Closed |
DB2 MAY CRASH WITH SQL1224N WHILE PROCESSING A QUERY WITH A LARGE NUMBER OF "OR" PREDICATES |
| product: |
DB2 FOR LUW / DB2FORLUW / 950 - DB2 |
| Problem description: |
DB2 may crash with SQL1224N while processing a query with a
large number of "OR" predicates, eg. 4000 "OR" predicates.
The stack trace will look something like:
disconnect_tree
disconnect_ptree
destroy_ptree
sqlnr_trans_pid
... (repeats many times)
sqlnr_match_prd
sqlnr_subsume_prds_sel_sel
sqlnr_subsume_prds
sqlnr_subsume_match
sqlnr_compute_matchinfo
sqlnr_optprep
sqlnr_optprep_action
sqlnr_comp... |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All users *
****************************************************************
* PROBLEM DESCRIPTION: *
* DB2 may crash with SQL1224N while processing a query with a *
* *
* large number of "OR" predicates, eg. 4000 "OR" predicates. *
* *
* *
* *
* The stack trace will look something like: *
* *
* *
* *
* disconnect_tree *
* *
* disconnect_ptree *
* *
* destroy_ptree *
* *
* sqlnr_trans_pid *
* *
* ... (repeats many times) *
* *
* sqlnr_match_prd *
* *
* sqlnr_subsume_prds_sel_sel *
* *
* sqlnr_subsume_prds *
* *
* sqlnr_subsume_match *
* *
* sqlnr_compute_matchinfo *
* *
* sqlnr_optprep *
* *
* sqlnr_optprep_action *
* *
* sqlnr_comp... *
****************************************************************
* RECOMMENDATION: *
* Upgrade to 9.5 FP8 or later. *
**************************************************************** |
| Local Fix: |
A workaround is to increase AGENT_STACK_SZ DBM configuration
parameter. |
| available fix packs: |
DB2 Version 9.5 Fix Pack 8 for Linux, UNIX, and Windows
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 |
The sqlnr_trans_pid function has been made non-recursive.
First fixed in 9.5 FP8. |
| Workaround |
A workaround is to increase AGENT_STACK_SZ DBM configuration
parameter. |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC75582
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 29.03.2011
11.07.2011
11.07.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.5.FP8
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.5.0.8
|
 |
