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Problem IC85887
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Status: Closed |
INCONSISTENCY IN FILTER FACTOR CALCULATION FOR RANGE PREDICATES VALUES THAT ARE BEYOND THE LAST HISTOGRAM |
| product: |
DB2 FOR LUW / DB2FORLUW / A10 - DB2 |
| Problem description: |
When range predicate literal values are beyond the highest
quantile value, filter factor calculation may be incorrect.
For example, suppose the highest quantile value for the column
DATE is '2012-07-25'. Range predicates (DATE >= '2012-07-25' and
DATE < '2012-07-26') can result in a combined FF of almost 0
rather than the FF of the equality predicate DATE =
'2012-07-25'. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* All *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Update to Version 10.1 Fix Pack 2 *
**************************************************************** |
| Local Fix: |
Use an equality predicate if it is logically equivalent to a set
of range predicates |
| Solution |
Fixed in Version 10.1 Fix Pack 2 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 14.08.2012
18.12.2012
18.12.2012 |
| Problem solved at the following versions (IBM BugInfos) |
|
| Problem solved according to the fixlist(s) of the following version(s) |
