DB2 FOR LUW / DB2FORLUW / A50 - DB2

Incorrect results from sort operations might occur when all of 
the following conditions are true: 
- DB2 version 10.5.0.5 (or a special build containing an 
incorrect fix for APAR IT01146) is being used. 
- The sort operation includes more than one column. 
- The sort operation includes one or more VARCHAR or VARCHAR FOR 
BIT DATA columns beyond the first column. 
- The sort operation includes more than 500 records containing 
duplicate data in the columns leading up to the VARCHAR column. 
 
In addition to potential wrong and/or incorrectly ordered 
results being returned to the user based on incorrect sort 
order, it is also possible that the incorrect sort could result 
in an unordered index if the index was created or rebuilt using 
the problematic version of DB2.  This could result in the 
following symptoms: 
- Index errors during insert, update or delete processing. 
- Incorrect results from an index scan. 
- Duplicates being inserted into a unique index. 
 
The db2dart command can be used to detect any unordered 
indexes. 
 
This problem does not exist in v10.1.

**************************************************************** 
* USERS AFFECTED:                                              * 
* All users                                                    * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 version 10.5.0.6.                             * 
****************************************************************

To avoid hitting the problem while on an affected built, execute 
the following command and then recycle the instance: 
db2set DB2_BINSORT=off 
 
After applying the workaround above and/or moving to a build 
with this APAR fix, to fix an affected index, execute the 
command above, recycle the instance and then perform one of the 
following actions: 
- Drop and recreate the affected index(es). 
- Execute the REORG INDEXES command with REBUILD option to 
rebuild the affected index(es).

The problem is first fixed in DB2 version 10.5.0.6.

not known / see Local fix

Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

22.05.2015
01.09.2015
29.01.2016