|
Problem IC98829
|
Status: Closed |
A QUERY MAY HANG WHEN IT CONTAINS CONNECT BY AND LEFT OUTER JOIN |
| product: |
DB2 FOR LUW / DB2FORLUW / A50 - DB2 |
| Problem description: |
A query may exhibit hanging symptom during its compilation when
all the following conditions are met:
1. Query has outer join construct.
2. One stream input to the outer join is a subquery having
CONNECT BY clause.
3. The same subquery that contains CONNECT BY also has
correlation predicate, i.e. a predicate referencing column from
outer query block.
To verify if the query hits this problem, use db2pd -dump and
search the following call stack in the dump file:
correlation_fromqun
sqlnr_OJprd_pushdown
sqlnr_optprep |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* A QUERY MAY HANG WHEN IT CONTAINS CONNECT BY AND LEFT OUTER *
* JOIN *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* First fixed in fix pack 4 of DB2 v10.5 *
**************************************************************** |
| Local Fix: |
N/A |
| available fix packs: |
DB2 Cancun Release 10.5.0.4 (also known as Fix Pack 4) for Linux, UNIX, and Windows
DB2 Version 10.5 Fix Pack 9 for Linux, UNIX, and Windows
|
| Solution |
First fixed in fix pack 4 of DB2 v10.5 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 20.01.2014
03.09.2014
03.09.2014 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.5.0.4
|
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