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Problem IC99096
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Status: Closed |
QUERY PERFORMANCE MAY BE POOR IN A FEDERATED DPF ENVIRONMENT FOR QUERIES INVOLVING THE LATERAL KEYWORD IN THE STATEMENT TEXT |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
Query performance may be poor in a Federated DPF environment for
queries involving the LATERAL keyword in the statement text.
Affected queries would typically contain the LATERAL keyword for
a sub-select of the query, an ORDER BY clause within the
subselect along with predicates containing references to outer
sub-selects, tables or nicknames from the query.
The output from db2exfmt will typically show a FILTER operation
above the SHIP operations containing the correlated predicate. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Users who use v10.1 *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 v10.1 fixpack 4 *
**************************************************************** |
| Local Fix: |
Manually write the query to push the correlated predicates into
any nested views |
| available fix packs: |
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
|
| Solution |
The problem is first fixed in v10.1 fixpack 4 |
| Workaround |
not known / see Local fix |
| BUG-Tracking |
forerunner : APAR is sysrouted TO one or more of the following: IC99315
follow-up : |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 30.01.2014
02.06.2014
02.06.2014 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.1.0.4
|
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