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DB2 - Problem description

Problem IT00790 Status: Closed

COLLATIONNAME IN SYSCAT.COLUMNS MIGHT BE CHANGED UNEXPECTEDLY TO NON_UNIQUE
IF LENGTH OF COLUMN IS ALTERED

product:
DB2 FOR LUW / DB2FORLUW / 970 - DB2
Problem description:
The value of COLLATIONNAME in SYSCAT.COLUMNS might be changed 
unexpectedly to NON_UNIQUE if the length of column is altered. 
 
Here is an example: 
 
$ db2 "create table test (c1 varchar(256))" 
$ db2 "select substr(TABNAME,1,10) as TABNAME, 
substr(COLNAME,1,10) as COLNAME, substr(COLLATIONSCHEMA,1,15) as 
COLLATIONSCHEMA, substr(COLLATIONNAME,1,13) as COLLATIONNAME, 
substr(LENGTH,1,10) as LENGTH from SYSCAT.COLUMNS where 
TABNAME='TEST'" 
 
TABNAME    COLNAME    COLLATIONSCHEMA COLLATIONNAME LENGTH 
---------- ---------- --------------- ------------- ---------- 
TEST       C1         SYSIBM          IDENTITY      256 
 
  1 record(s) selected. 
 
$ db2 "alter table TEST alter column C1 set data type 
varchar(1024)" 
 
$ db2 "select substr(TABNAME,1,10) as TABNAME, 
substr(COLNAME,1,10) as COLNAME, substr(COLLATIONSCHEMA,1,15) as 
COLLATIONSCHEMA, substr(COLLATIONNAME,1,13) as COLLATIONNAME, 
substr(LENGTH,1,10) as LENGTH from SYSCAT.COLUMNS where 
TABNAME='TEST'" 
 
TABNAME    COLNAME    COLLATIONSCHEMA COLLATIONNAME LENGTH 
---------- ---------- --------------- ------------- ---------- 
TEST       C1         SYSIBM          NON_UNIQUE    1024 
 
  1 record(s) selected.
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* All                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* See Error Description                                        * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to Version 9.7 Fix Pack 10                           * 
****************************************************************
Local Fix:
Not available.
Solution
Problem was first fixed in DB2 UDB Version 9.7 Fix Pack 10
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :

03.04.2014
01.12.2014
01.12.2014
Problem solved at the following versions (IBM BugInfos)
9.7.FP10
Problem solved according to the fixlist(s) of the following version(s)
9.7.0.10 FixList