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DB2 - Problembeschreibung

Problem IC92524 Status: Geschlossen

COLLECTING INDEX-ONLY STATISTICS CAN INCORRECTLY UPDATE
SYSCAT.COLUMNS.NQUANTILES AND SYSCAT.COLUMNS.NMOSTFREQ TO -1.

Produkt:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problembeschreibung:
If a column has distribution statistics and it is the leading 
column in an index, collecting index-only statistics for the 
index will incorrectly update SYSCAT.COLUMNS.NQUANTILES and 
SYSCAT.COLUMNS.NMOSTFREQ to -1, suggesting the column does not 
have distribution statistics.  However, the column's 
distribution statistics are not affected in the 
SYSCAT.SYSCOLDIST catalog.  Also not affected are the 
distribution statistics in the table's packed descriptor which 
is used by the query optimizer. 
 
The problem therefore affects applications that query 
SYSCAT.COLUMNS.NQUANTILES and SYSCAT.COLUMNS.NMOSTFREQ, instead 
of SYSCAT.SYSCOLDIST, to determine if a column has distribution 
statistics.  The db2look tool is affected by this problem.  When 
the problem has occurred, db2look mimic output will not contain 
distribution statistics information for the affected columns.
Problem-Zusammenfassung:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 V9.7 FP9                                      * 
****************************************************************
Local-Fix:
Perform a table and indexes statistics collection on the 
affected tables.
verfügbare FixPacks:
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

Lösung
Fixed in DB2 V9.7 FP9
Workaround
keiner bekannt / siehe Local-Fix
Bug-Verfolgung
Vorgänger  : APAR is sysrouted TO one or more of the following: IC95347 IC98550 
Nachfolger : 
Weitere Daten
Datum - Problem gemeldet    :
Datum - Problem geschlossen :
Datum - der letzten Änderung:
23.05.2013
17.12.2013
17.12.2013
Problem behoben ab folgender Versionen (IBM BugInfos)
9.7.FP9
Problem behoben lt. FixList in der Version
9.7.0.9 FixList
9.7.0.9 FixList