IT38955: WRONG RESULTS FROM SELECT COUNT QUERY ON "ORGANIZE BY COLUMN" TABLE

Db2 Version 11.1 Mod 4 Fix Pack 7 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• Inconsistent results are possible when SELECT COUNT query is
  executed on "ORGANIZE BY COLUMN" table.
  The issue is happening due to internal dictionary and encoding
  optimizations.
  
  Query has to have an equality predicate.
  Example:
  select count(*) from t1 where myint=563422
  
  The issue does not happen if the predicate is changed to use
  "like" or an arithmetic operation:
  
  select count(*) from t1 where myint like '563422%'
  select count(*) from t1 where (myint*2) = 1126844
  

Local fix

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * all                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to 11.1.4.7                                          *
  ****************************************************************
  

Problem conclusion

• Upgrade to 11.1.4.7
  

Temporary fix

Comments

APAR Information

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

  IT37674

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

Fix information

• Fixed component name

  DB2 FOR LUW

• Fixed component ID

  DB2FORLUW

Applicable component levels

• RB10 PSN

     UP