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Problem IC91749
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Status: Closed |
OPTIMIZER MIGHT CHOOSE A SUB-OPTIMAL ACCESS FOR TABLE WITH THE SAME SINGLE COLUMN RANGE PARTITIONING KEY AND DISTRIBUTION KEY |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
Description:
The optimizer might choose a table scan over an index access of
a range partitioned table in a database partitioned environment
under the following conditions:
- the table is range partitioned and hash distributed on the
same single column; e.g.
create table t1 (C1 date, ...) distribute by hash (C1)
partition by range (C1) (starting (minvalue) ending
('2010-12-31'), starting('2011-01-01') ending ('2011-01-31'),
...)
- the query contains an equality predicate on the column; e.g.
C1='2012-01-15'
- a partitioned index containing C1 in the key exists
This problem is more likely to occur for tables with a large
number of range partitions where the majority are empty. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 Version 10.1 Fixpack 3. *
**************************************************************** |
| Local Fix: |
You can use an optimization guideline to produce an index
access. |
| available fix packs: |
DB2 Version 10.1 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 4 for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 3a for Linux, UNIX, and Windows
DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows
|
| Solution |
Fixed in Version 10.1 Fixpack 3. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 22.04.2013
10.10.2013
10.10.2013 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 10.1.0.3
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 |
| 10.1.0.3
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