DATA_LENGTH in all_tab_columns in BYTE/CHAR???

Hi
in the Oracle 11gR2 or 10gR2 documentation you find the following description of ALL_TAB_COLUMNS.DATA_LENGTH.
DATA_LENGTH NUMBER NOT NULL Length of the column (*in bytes*)But what about VARCHAR2 fields which have been created with
NLS_LENGTH_SEMANTICS='CHAR'My observation is, that in 10g ALL_TAB_COLUMNS.DATA_LENGTH shows the length in what ever mode, you have created the table. So, if I have created a VARCHAR2 field as VARCHAR2(4 CHAR), then ALL_TAB_COLUMNS.DATA_LENGTH will show 4. In 11g however the field shows really the length in bytes. So I observed data_length=16 for a field which had been defined as VARCHAR2(4 CHAR) on a 11gR2 database with NLS_CHARACTERSET= "AL32UTF8".
Is there any contrary observation or experience?

Thanks guys,
you are right my 10g DB used to have
NLS_CHARACTERSET WE8ISO8859P1which makes everything very clear.
Very helpful is the field CHAR_LENGTH and CHAR_USED which indeed contain the information I need.
Thanks.

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BANNER
Oracle Database 10g Enterprise Edition Release 10.2.0.4.0 - 64bi
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D VARCHAR2(3 CHAR)
E VARCHAR2(3)
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6 data_scale
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Edited by: isotope on Mar 3, 2010 6:46 AM

Anurag Tibrewal wrote:
It is just because you have different NLS_LENGTH_SEMANTICS in v$nls_parameter for both the database. It is BYTE in R10 and CHAR in R11.
I cannot query v$nls_parameter in the 10g database. I tried this testcase with the ALTER SESSION and checking with nls_session_parameter in both 10g and 11g. The client is 11g in each case.
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cl scr
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-- Try CHAR semantics
alter session set nls_length_semantics=char;
select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
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create table t (
a char(3 char),
b char(3 byte),
c char(3),
d varchar2(3 char),
e varchar2(3 byte),
f varchar2(3)
desc t
select table_name,
 column_name,
 data_type,
 data_length,
 data_precision,
 data_scale
from user_tab_columns
where table_name = 'T';
-- Try BYTE semantics
alter session set nls_length_semantics=byte;
select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
drop table t;
create table t (
a char(3 char),
b char(3 byte),
c char(3),
d varchar2(3 char),
e varchar2(3 byte),
f varchar2(3)
desc t
select table_name,
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BANNER
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PARAMETER VALUE
NLS_LENGTH_SEMANTICS CHAR
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Table dropped.
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2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
8 );
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SQL> --
SQL> desc t
Name Null? Type
A CHAR(3)
B CHAR(3 BYTE)
C CHAR(3)
D VARCHAR2(3)
E VARCHAR2(3 BYTE)
F VARCHAR2(3)
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2 column_name,
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4 data_length,
5 data_precision,
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TABLE_NAME COLUMN_NAME DATA_TYPE DATA_LENGTH DATA_PRECISION DATA_SCALE
T A CHAR 12 <==
T B CHAR 3
T C CHAR 12 <==
T D VARCHAR2 12 <==
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T F VARCHAR2 12 <==
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NLS_LENGTH_SEMANTICS BYTE
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Table dropped.
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2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
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B CHAR(3)
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E VARCHAR2(3)
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T A CHAR 12 <==
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SQL>
SQL> select * from v$version;
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CORE 11.1.0.6.0 Production
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NLS_LENGTH_SEMANTICS CHAR
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2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
7 f varchar2(3)
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C CHAR(3)
D VARCHAR2(3)
E VARCHAR2(3 BYTE)
F VARCHAR2(3)
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4 data_length,
5 data_precision,
6 data_scale
7 from user_tab_columns
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T A CHAR 3
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T C CHAR 3
T D VARCHAR2 3
T E VARCHAR2 3
T F VARCHAR2 3
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SQL> select * from nls_session_parameters where parameter = 'NLS_LENGTH_SEMANTICS';
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NLS_LENGTH_SEMANTICS BYTE
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SQL> drop table t;
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2 a char(3 char),
3 b char(3 byte),
4 c char(3),
5 d varchar2(3 char),
6 e varchar2(3 byte),
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A CHAR(3 CHAR)
B CHAR(3)
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F VARCHAR2(3)
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