IT22968: RUNSTATS with index sampling can produce INCORRECT NLEAF OF PARTITIONED INDEX FOR LARGE RANGE PARTITIONED TABLE

Db2 Version 11.1 Mod 3 Fix Pack 3 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix001 for Linux, UNIX, and Windows
Db2 Version 11.1 Mod3 Fix Pack3 iFix002 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• When executing Runstats on a range partitioned table with one or
  more partitioned indexes, the index stats can be incorrect when
  the index sampling option is used.
  This issue mostly occurs for large number of rows in a
  partitioned table.
  
  As a result, Runstats might calculate an incorrect table Card.
  

Local fix

• Don't use the INDEXSAMPLE option or use an index sampling rate
  less than the table sampling rate. The latter will only ensure
  the cardinality statistic is calculated correctly.
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * All                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * NA                                                           *
  ****************************************************************
  

Problem conclusion

• NA
  

Temporary fix

Comments

APAR Information

• APAR is sysrouted FROM one or more of the following:

• APAR is sysrouted TO one or more of the following:

  IT25996

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

     UP