Gurus, what exactly is the purpose of this NLS_LENGTH_SEMANTICS para?

Gurus, it would be greatly appreciated if you could also explain what the exact purpose of this NLS_LENGTH_SEMANTICS parameter and what "LENGTH SEMATICS" mean?
I read some posts in this Forum and got some idea but still don't get the REAL PURPOSE of this variable.
I mean, I have never changed these parameters in my 5 years as an Oracle developer when creating tables or doing anything else for that matter..
I have done all my programming and everything in ENGLISH. I have never used multi-ling apps.
Our DBs are 10.2.0.4.0s.
Our DB character set is WE8ISO8859P1.
NLS_NCHAR_CHARACTERSET is AL16UTF16.
NLS_LENGTH_SEMANTICS is BYTE
(1.) Why would anybody want to change this NLS_LENGTH_SEMANTICS to CHAR??
(2.) Is it only used when you want to store NON-ENGLISH characters like Chinese, Persian etc.?
(3.) If so why?
(4.) Is there a storage advantage when CHAR is used instead of BYTES? Can you put BOTH as the parameter value?
(5.) Is there issues when searching when non-English characters are stored in the DB??
(6.) Is AL16UTF16 a multi-byte character set?
(7.) Is WE8ISO8859P1 multi-byte or single-byte character set?? How to find these things???
(8.) What is the real advantage of this NLS_LENGTH_SEMANTICS column and when should we use it and not use it??
In easy to understand language please.
thanks in advance.
Edited by: user12240205 on Oct 28, 2011 12:36 AM

user12240205 wrote:
Gurus, it would be greatly appreciated if you could also explain what the exact purpose of this NLS_LENGTH_SEMANTICS parameter and what "LENGTH SEMATICS" mean?
This is useful only when you use multi bytes character set for you database. Multi bytes characterset means the database stores one character more than one bytes. It can use 2-4 bytes and it can be vary even within one character set. I mean e.g. AL32UTF8 can store an English character in one byte while it can store a Chinese char in 4 bytes only.
VARCHAR2(10 CHAR) means that you define the maximum length of your column in characters no matter how many bytes needed for those to store.
You can also check the docs. There is a really good book called [url http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch1overview.htm#sthref51]Oracle® Database Globalization Support Guide also [url http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/ch3globenv.htm#sthref385]LENGTH SEMATICS has a page in it...
I read some posts in this Forum and got some idea but still don't get the REAL PURPOSE of this variable.
I mean, I have never changed these parameters in my 5 years as an Oracle developer when creating tables or doing anything else for that matter..
I have done all my programming and everything in ENGLISH. I have never used multi-ling apps.
Our DBs are 10.2.0.4.0s.
Our DB character set is WE8ISO8859P1.
NLS_NCHAR_CHARACTERSET is AL16UTF16.
NLS_LENGTH_SEMANTICS is BYTE
(1.) Why would anybody want to change this NLS_LENGTH_SEMANTICS to CHAR??I think the above explanation gives you the answer.
>
(2.) Is it only used when you want to store NON-ENGLISH characters like Chinese, Persian etc.? mainly yes. but for any other multi-byte character set
>
(3.) If so why? see above.
>
(4.) Is there a storage advantage when CHAR is used instead of BYTES? Can you put BOTH as the parameter value?BYTE or CHAR
you can use only one, but you can change the value in your sessions. and you can mix CHAR and BYTES column length definitions in a table.
>
(5.) Is there issues when searching when non-English characters are stored in the DB??>
(6.) Is AL16UTF16 a multi-byte character set?16 means 16 bites and this character set always uses 2 bytes to store any characters if I know well.
>
(7.) Is WE8ISO8859P1 multi-byte or single-byte character set?? How to find these things???single.
See MB for multibyte in comment column in [url http://download.oracle.com/docs/cd/B19306_01/server.102/b14225/applocaledata.htm#sthref1960]Recommended Database Character Sets
>
(8.) What is the real advantage of this NLS_LENGTH_SEMANTICS column and when should we use it and not use it??Well in a multi language column where many languages can be stored it is good to use IMHO.
So you can type/store into that column equal amount of Japanese, Chinese or English characters.
>
In easy to understand language please.
thanks in advance.
Finally if you have MOS access see
[url https://support.oracle.com/CSP/main/article?cmd=show&type=NOT&doctype=BULLETIN&id=144808.1]Examples and limits of BYTE and CHAR semantics usage (NLS_LENGTH_SEMANTICS) ID 144808.1
Edited by: Kecskemethy on Oct 28, 2011 7:46 AM

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