Change NLS_LENGTH_SEMANTICS from BYTE to CHAR on Oracle 9i2 problem!

Hi,
I have created a new database on Oracle 9i 2, I did not find the correct pfile parameter for the NLS_LENGTH_SEMANTICS setting.
So have created a standart UTF8 database and now I am trying to change the standard NLS_LENGTH_SEMANTICS=BYTE to CHAR. When I execute the following command in SQL PLUS "ALTER SYSTEM SET NLS_LENGTH_SEMANTICS=CHAR SCOPE=BOTH"
The system is tells me that command is successfully executed.
But when I look at the NLS_DATABASE_PARAMETERS table I do not see any change for the NLS_LENGTH_SEMANTICS parameter.
I have also restarted the instance but still everything is the same as it was before.
Do you know what I am doing wrong?
Regards
RobH

Hi,
Yeah you are right, the nls_session_parameters "NLS_LENGTH_SEMANTICS" for the app user is set to CHAR.
This means that NLS_DATABASE_PARAMETERS is from the SYS or SYSTEM user view?
Thanks a lot
Regards
RobH

Similar Messages

NLS_LENGTH_SEMENTICS from BYTE TO CHAR

Hi,
For supporting multibyte character, we need to change NLS_LENGTH_SEMENTICS parameter from BYTE to CHAR. But this parameter setting will effect for new database tables created thereafter. To change the storage characteristics for existing database tables we explicitly executed Alter statements for database tables for columns having datatype as Varchar2 and Char.
Problem:
======
Since the number of database tables in PRODUCTION are very high and contains approx. 600 million of records spread over 400 database tables, we are not in a position to afford the time which will be spent in altering these database tables in PRODUCTION.
We ran the test by alter script in System Test environment and alteration of database tables covering 150 tables and 200 million of records was carried out in almost 16-20 hrs.
APPROACHES WE HAVE IN MIND
==========================
1. Alter all the table columns (We tried the same and taking too much time)
2. Export /Import with NLS_LENGTH_SEMENTICS set as CHAR(We discuss with our DBA about this approach and found that it will also take too much time and there is RISK of data inconsistency)
3. Drop the index of the table, run alter script for changing storage type BYTE to CHAR , and rebuild the index (this is also taking too much time).
All above approaches are very costly in terms of time, that we cannot afford.
If any one having better solution then please suggest.
thanks in advance
Syed

Hi
We are also facing a similar problem
We ran alter table scripts and now compiling the objects
and that is taking lot of time.
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Sunil Choudhary

Exp/imp, convertion from byte to char.

Hi,
I have a dump file exported from a database with nls_lenght_sematics=BYTES. When i import it into a database with nls_lenght_sematics=CHAR, it is retaining the BYTE charecteristics. Is there any way to change it into CHAR while importing. This for globalization support.
Thanks
Muneer

Hi Muneer,
No, import always preserve the LENGTH semantics of the original columns.
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Nat

Changing homedirectories from AFP to NFS cures all Office Problems?

Hi all,
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3.) which protocol do you use for sharing homedirectories?
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I allready did the following to change an AFP shared homedirectory to NFS:
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This worked well (for a short look on it). The only problem was, that the subfolders in the sidebar of the Finder window did not work, and had to be reseted.
Any other suggestions?
Greetings
MacSEK

Hello,
Today a friend reported this problem to me. This problem was only to Word, to Excel no.
In my case the guilty was the add-in PDFCOMPLETE in WORD 2013.
I saw it in programs list on Control Panel. It belong to PDF Complete, Inc.
They have a HP computer. When I uninstalled this add-in from programs list the problem solved !
I did that today. Now they are able to change language and also to put tone on Greek vowels.
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Change NLS_LENGTH_SEMANTICS to CHAR

I need to change the length semantics of all the tables in an existing application schema from BYTE to CHAR.
I have explored two methods
1- Datapump export/import
Due to large tables with numerous CLOB columns, the performance of the export/import is hardly acceptable for our production downtime window.
2- ALTER TABLE OWNER.TABLE modify (C160 VARCHAR2(255 CHAR))
This solution is to alter all table for all varchar2 or char columns.
Questions :
a) Does the alter table solution modify only the data dictionary or does it also modify/rearrange the blocks for existing rows.
a.1) What happens to a row with a varchar(3) string previously stored in three bytes when you change the semantics to CHAR and you update that string with two-bytes charactyers ? Where does the "enlarged" field in the row piece/block ? Does it go at the end of the row piece ?
b) Are there performance or management benefits to use one methods over the other one ?
Thanks for any information you can provide.
Serge Vedrine
Edited by: [email protected] on 13-Mar-2009 11:12 AM
Edited by: [email protected] on 13-Mar-2009 11:24 AM

## I have explored two methods
## 1- Datapump export/import
This will not work. Export/import preserves the length semantics
## 2- ALTER TABLE OWNER.TABLE modify (C160 VARCHAR2(255 CHAR))
This is the simplest approach. You can write a simple select on the view ALL_TAB_COLUMNS to generate the necessary ALTER TABLE statements.
## Questions :
## a) Does the alter table solution modify only the data dictionary or does it also modify/rearrange the blocks for existing rows.
Only data dictionary.
## a.1) What happens to a row with a varchar(3) string previously stored in three bytes when you change the semantics to CHAR
## and you update that string with two-bytes charactyers ? Where does the "enlarged" field in the row piece/block ? Does it go at the end of the row piece ?
This is the standard behavior of UPDATE when the new value is longer than the old one. If there is place in the block, the new longer value will push itself into the old place moving the rest of the block data to higher offsets. If there is no place, an extra block will be grabbed and inserted into the chain of blocks holding the row. This is called "row chaining".
## b) Are there performance or management benefits to use one methods over the other one ?
As I said, export/import will not work anyway.
-- Sergiusz

Oracle Best practices for changing Byte to Char on Varchar2 columns

Dear Team,
Application Team wanted to change Byte to Char on Varchar2 columns to accommodate Multi byte character on couple of production tables.
Wanted to know is it safe to have mixture of BYTE and CHAR semantics in the same table i have read on the couple of documents that It's good practice to avoid using a mixture of BYTE and CHAR semantics columns in the same table.
What happens if we have mixture of BYTE and CHAR semantics columns in the same table?
Do we need to gather stats & rebuild indexes on the table after these column changes .
Thanks in Advance !!!
SK

Application Team wanted to change Byte to Char on Varchar2 columns to accommodate Multi byte character on couple of production tables.
Wanted to know is it safe to have mixture of BYTE and CHAR semantics in the same table i have read on the couple of documents that It's good practice to avoid using a mixture of BYTE and CHAR semantics columns in the same table.
No change is needed to 'accommodate Multibyte characters'. That support has NOTHING to do with whether a column is specified using BYTE or CHAR.
In 11g the limit for a VARCHAR2 column is 4000 bytes, period. If you specify CHAR and try to insert 1001 characters that each take 4 bytes you will get an exception since that would require 4004 bytes and the limit is 4000 bytes.
In practice the use of CHAR is mostly a convenience to the developer when defining columns for multibyte characters. For example for a NAME column you might want to make sure Oracle will allocate room for 50 characters REGARDLESS of the actual length in bytes.
If you provide a name of 50 one byte characters then only 50 bytes will be used. Provide a name of 50 four byte characters and 200 bytes will be used.
So if that NAME column was defined using BYTE how would you know what length to use for the column? Fifty BYTES will seldom be long enough and 200 bytes SEEMS large since the business user wants a limit of FIFTY characters.
That is why such columns would typically use CHAR; so that the length (fifty) defined for the column matches the logical length of the number of characters.
What happens if we have mixture of BYTE and CHAR semantics columns in the same table?
Nothing happens - Oracle could care less.
Do we need to gather stats & rebuild indexes on the table after these column changes .
No - not if you by 'need' you mean simply because you made ONLY that change.
But that begs the question: if the table already exists, has data and has been in use without their being any problems then why bother changing things now?
In other words: if it ain't broke why try to fix it?
So back to your question of 'best practices'
Best practices is to set the length semantics at the database level when the database is first created and to then use that same setting (BYTE or CHAR) when you create new objects or make DDL changes.
Best practices is also to not fix things that aren't broken.
See the 'Length Semantics' section of the globalization support guide for more best practices
http://docs.oracle.com/cd/E11882_01/server.112/e10729/ch2charset.htm#i1006683

Large_pool value changed from 0 to 8388608 after Oracle Patch 10g Release 2

10g Release 2 (10.2.0.4) Patch Set 3 for HP-UX Itanium
Recently we upgrade Oracle software with patch set 6810189.
and upgraded database using dbua.
earlier we set large_pool to 0 and after database upgrade, this large_pool changed to 8388608 bytes. Is this normal with DBUA?
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I found some other procedure in order for you to recreate the environment file:
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LD_LIBRARY_PATH = <10g ORACLE_HOME/lib, 10g ORACLE_HOME/ctx/lib>
ORACLE_SID = instance name running on this database node.
PATH= $PATH:$ORACLE_HOME/bin;
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Now you should have the officially created environment file.
HTH.
Arnoud Roth

V3.0, NLS_LENGTH_SEMANTICS byte vs. char for CREATE TABLE

Hi,
When creating a new table (via "New Table" or "Data Load ...")
NLS_LENGTH_SEMANTICS of table columns are always in byte even when NLS_LENGTH_SEMANTICS
is set to char for the instance (and so as default for all sessions) and has not explicitly changes for the current session.
Is there a way to change this behavior or could this be a gebnerell problem in 3.0.
I would like SQL Developer to use the standard settings of the instance as long as I don't set it different for a session.
Please give me a littel hint how to solve this issue.
Thanks in advance.
Andre
--2011/07/15-------------------------------------------------------------------------------------------
Hello,
I'm not sure wether or not this is a too complicated or just as silly question.
However it's still an issue for me.
It would be great if someone could at least confirm or refuse it.
Hoping for an answer- Thank you again!
Andre
Edited by: andreml on Jul 15, 2011 2:10 AM
Edited by: andreml on Jul 15, 2011 2:11 AM

Hi,
If you click on any given table in the Connections view, an object viewer opens for that table. Its column tab lists all columns with attributes for column_name, data_type, and so on. The data_type info includes the length semantics, e.g., VARCHAR2(30 BYTE).
Regards,
Gary Graham
SQL Developer Team

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So, does this mean that we add 256 to eliminate the sign?No. You need the whole line to convert a signed byte into an int between 0 and 255.
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15.
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>
Received as initial value:
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NOTE: Not sure why but my posts from yesterday are not visible today. Even worse is that I can see them in one browser (FireFox) but not in Internet explorer. Crazy browser day I am having.

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null

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Change NLS_LENGTH_SEMANTICS from BYTE to CHAR on Oracle 9i2 problem!

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