|
Problem IC67187
|
Status: Closed |
COMPRESSION STATISTIC PCTPAGESSAVED MAY BE INACCURATE. |
| product: |
DB2 FOR LUW / DB2FORLUW / 980 - DB2 |
| Problem description: |
PCTPAGESSAVED is set to 0 when RUNSTATS is executed on just the
indexes of the table via the FOR INDEXES clause, for example:
RUNSTATS ON TABLE s.t FOR INDEXES ALL
Under rare situations, incorrect intermediate calculations can
lead to an inaccurate PCTPAGESSAVED value, including 0 and
negative values. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* ALL *
****************************************************************
* PROBLEM DESCRIPTION: *
* See Error Description *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 9.8 FP3 or Subsequent Fix Pack *
**************************************************************** |
| Local Fix: |
Determine compression benefit from other compression statistics
PCTROWSCOMPRESSED and AVGROWCOMPRESSIONRATIO.
If PCTPAGESSAVED is 0 after an index-only RUNSTATS operation,
collect statistics again, ensuring to collect statistics for the
table as well as its indexes, for example:
RUNSTATS ON TABLE s.t AND INDEXES ALL |
| available fix packs: |
DB2 Version 9.8 Fix Pack 3 for Linux, UNIX, and Windows
DB2 Version 9.8 Fix Pack 4 for AIX and Linux
DB2 Version 9.8 Fix Pack 5 for AIX and Linux
|
| Solution |
Problem First Fixed in DB2 Version 9.8 Fix Pack 3 |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 12.03.2010
10.12.2012
10.12.2012 |
| Problem solved at the following versions (IBM BugInfos) |
9.8.FP3
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.8.0.3
|
 |
