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DB2 - Problem description

Problem IC82716 Status: Closed

DB2 QUERY COMPILER CAN TRAP WHEN STMTHEAP is AUTOMATIC AND MEMORY is
CONSTRAINED

product:
DB2 FOR LUW / DB2FORLUW / 950 - DB2
Problem description:
When STMTHEAP is automatic and memory is constrained, a memory 
allocation request to STMTHEAP can fail; but the next allocation 
request can succeed. The query compiler can fail to handle such 
a situation. When the problem is encountered, you can observe 
traps. 
 
An example trap is below 
 
sqlno_greedy_resume_part 
sqlno_greedy_next_part 
sqlno_crule_join 
sqlno_gen_partitions_for_QTB 
sqlno_plan_end_opr 
sqlno_each_opr 
sqlno_walk_qun 
sqlno_each_opr
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* When STMTHEAP is automatic and memory is constrained, a      * 
* memory                                                       * 
* allocation request to STMTHEAP can fail; but the next        * 
* allocation                                                   * 
* request can succeed. The query compiler can fail to handle   * 
* such                                                         * 
* a situation. When the problem is encountered, you can        * 
* observe                                                      * 
* traps.                                                       * 
*                                                              * 
* An example trap is below                                     * 
*                                                              * 
* sqlno_greedy_resume_part                                     * 
* sqlno_greedy_next_part                                       * 
* sqlno_crule_join                                             * 
* sqlno_gen_partitions_for_QTB                                 * 
* sqlno_plan_end_opr                                           * 
* sqlno_each_opr                                               * 
* sqlno_walk_qun                                               * 
* sqlno_each_opr                                               * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 UDB version 9.5 fixpack 10.                   * 
****************************************************************
Local Fix:
The following can help to reduce the possibility of encountering 
the problem: 
 
1) set STMTHEAP to a fixed value 
2) allow room for STMTHEAP to grow by increasing APPL_MEMORY and 
INSTANCE_MEMORY
Solution
Problem was first fixed in DB2 UDB Version 9.5 Fix Pack 10.
Workaround
not known / see Local fix
BUG-Tracking
forerunner  : APAR is sysrouted TO one or more of the following: IC82772 IC83237 IC87837 
follow-up : 
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
18.04.2012
21.08.2012
21.08.2012
Problem solved at the following versions (IBM BugInfos)
9.5.FP10
Problem solved according to the fixlist(s) of the following version(s)
9.5.0.10 FixList
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