IT13347: DB2 MIGHT PRODUCE INCORRECT RESULTS WHEN RUNNING QUERIES WITH EQUALITY TIMESTAMP PREDICATES

DB2 Version 10.1 Fix Pack 6 for Linux, UNIX, and Windows

APAR status

• Closed as program error.

Error description

• DB2 might produce incorrect results when running queries with
  equality timestamp predicates
  Description:
  Under rare scenarios, DB2 might produce incorrect results if the
  following conditions are true:
  1) The query contains two or more subselects and tables
  2) Each of these have atleast one column of type TIMESTAMP with
  default precision 6
  3) One or more of these columns are projected out from the
  select
  4) The columns also contains an equality predicate with a string
  representation of timestamp
  
  eg. Select *
         from T1, (Select TS
                          from T2
                          where T2.TS = '2015-01-01 00:00:00') as
  tmp
         where T1.TS = '2015-01-01 00:00:00' and tmp.TS =
  '2015-01-01 00:00:00'
  

Local fix

• Workaround:
  1) Turn on statement concentrator
  2) Modify the query to introduce T1.TS = T2.TS predicate
  

Problem summary

• ****************************************************************
  * USERS AFFECTED:                                              *
  * ALL                                                          *
  ****************************************************************
  * PROBLEM DESCRIPTION:                                         *
  * See Error Description                                        *
  ****************************************************************
  * RECOMMENDATION:                                              *
  * Upgrade to DB2 10.1 Fix Pack 6                               *
  ****************************************************************
  

Problem conclusion

• First fixed in DB2 10.1 Fix Pack 6
  

Temporary fix

Comments

APAR Information

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

  IT09013

• 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

• RA10 PSN UP

     FIX