|
Problem IC76910
|
Status: Closed |
QUERY_PREP_COST.AVERAGE_EXECUTION_TIME_MS IS NOT ACCURATE |
| product: |
DB2 FOR LUW / DB2FORLUW / 970 - DB2 |
| Problem description: |
The expression for QUERY_PREP_COST.AVERAGE_EXECUTION_TIME_MS is
wrong. It is derived from these columns:
BIGINT SYSIBMADM.SNAPDYN_SQL.TOTAL_EXEC_TIME (seconds)
BIGINT SYSIBMADM.SNAPDYN_SQL.TOTAL_EXEC_TIME_MS (microseconds)
BIGINT SYSIBMADM.SNAPDYN_SQL.NUM_EXECUTIONS
AVERAGE_EXECUTION_TIME_MS should be the fractional part of the
average execution time and should be in
microseconds. |
| Problem Summary: |
****************************************************************
* USERS AFFECTED: *
* Any user of QUERY_PREP_COST admin view *
****************************************************************
* PROBLEM DESCRIPTION: *
* See above. *
****************************************************************
* RECOMMENDATION: *
* Upgrade to DB2 9.7 FP5 or later *
**************************************************************** |
| Local Fix: |
Calculate the fractional part of average execution time from the
TOTAL_EXEC_TIME, TOTAL_EXEC_TIME_MS and NUM_EXECUTIONS columns
of the SNAPDYN_SQL admin view. |
| available fix packs: |
DB2 Version 9.7 Fix Pack 5 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 6 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 7 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 8 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9 for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 9a for Linux, UNIX, and Windows
DB2 Version 9.7 Fix Pack 10 for Linux, UNIX, and Windows
|
| Solution |
The fix is to calculate the fractional part of the average
execution time and express it in microseconds.
The fix is included in DB2 v9.7 FP5. |
| Workaround |
not known / see Local fix |
| Timestamps |
Date - problem reported :
Date - problem closed :
Date - last modified :
| 10.06.2011
16.12.2011
16.12.2011 |
| Problem solved at the following versions (IBM BugInfos) |
9.7.FP5
|
| Problem solved according to the fixlist(s) of the following version(s) |
| 9.7.0.5
|
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