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DB2 - Problem description

Problem IC72043 Status: Closed

Db2look dependency on locale settings might introduce wrong values on mimic
information

product:
DB2 FOR LUW / DB2FORLUW / 910 - DB2
Problem description:
Given the following table: 
 
CREATE TABLE "TEST"."TAB1"  ( 
                  "FIELDTYPE" CHAR(1) FOR BIT DATA ) 
 
 
db2 " select hex(HIGH2KEY) from sysstat.columns  WHERE COLNAME = 
'FIELDTYPE' AND TABNAME = 'TAB1' AND TABSCHEMA = 'TEST' " 
27E827 
 
The db2look output of 
 
db2look -d tlook -m -l -a -e -z TEST -t TAB1 -o tlook.out 
 
Depending on the locale settings, can show in the mimic 
information: 
 
 
UPDATE SYSSTAT.COLUMNS 
SET COLCARD=36, 
    NUMNULLS=0, 
    SUB_COUNT=-1, 
    SUB_DELIM_LENGTH=-1, 
    AVGCOLLENCHAR=-1, 
    HIGH2KEY=X'1A',  <<< This is incorrect and we are 
introducing incorrect values if we replay this ddl 
    LOW2KEY=X'14', 
    AVGCOLLEN=2 
WHERE COLNAME = 'FIELDTYPE' AND TABNAME = 'TAB1' AND TABSCHEMA = 
'TEST'; 
 
or 
 
UPDATE SYSSTAT.COLUMNS 
SET COLCARD=36, 
    NUMNULLS=0, 
    SUB_COUNT=-1, 
    SUB_DELIM_LENGTH=-1, 
    AVGCOLLENCHAR=-1, 
    HIGH2KEY='',  In here we have the character representation 
of 0xE28 which is a e with a tilde <<< this is incorrect and if 
we replay this ddl it will actually fail 
    LOW2KEY=X'14', 
    AVGCOLLEN=2 
WHERE COLNAME = 'FIELDTYPE' AND TABNAME = 'TAB1' AND TABSCHEMA = 
'TEST'; 
 
Depending on the locale settings 
 
 
The correct value should be: 
 
UPDATE SYSSTAT.COLUMNS 
SET COLCARD=36, 
    NUMNULLS=0, 
    SUB_COUNT=-1, 
    SUB_DELIM_LENGTH=-1, 
    AVGCOLLENCHAR=-1, 
    HIGH2KEY=X'E8', 
    LOW2KEY=X'14', 
    AVGCOLLEN=2 
WHERE COLNAME = 'FIELDTYPE' AND TABNAME = 'TAB1' AND TABSCHEMA = 
'TEST '
Problem Summary:
**************************************************************** 
* USERS AFFECTED:                                              * 
* ALL                                                          * 
**************************************************************** 
* PROBLEM DESCRIPTION:                                         * 
* The fix will review the use of isalnum calls by db2look      * 
* code, as                                                     * 
* these calls are locale dependent (on LC_CTYPE).              * 
**************************************************************** 
* RECOMMENDATION:                                              * 
* Upgrade to DB2 Version 9.1 and Fix Pack 10                   * 
****************************************************************
Local Fix:
Check settings of LC_CTYPE as db2look is using isalnum calls.
Solution
Problem was first fixed in DB2 Version 9.1 and Fix Pack 10
Workaround
not known / see Local fix
Timestamps
Date  - problem reported    :
Date  - problem closed      :
Date  - last modified       :
20.10.2010
10.06.2011
10.06.2011
Problem solved at the following versions (IBM BugInfos)
9.1.
Problem solved according to the fixlist(s) of the following version(s)