|
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
|
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