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Character Set [message #284075] Wed, 28 November 2007 15:12 Go to next message
Daxesh
Messages: 61
Registered: July 2004
Member
Hello,
I have a database with the Character Set WE8MSWIN1252. Now for another small application I need the Character set AL32UTF8 for this application I do not need to create a separate database since its really small. So I was thinking that I can create a separate schema in the existing database. So it is doable? BTW what is the difference between WE8MSWIN1252 and AL32UTF8 character set?

Any input would be appreciated.
Thanks...
Re: Character Set [message #284083 is a reply to message #284075] Wed, 28 November 2007 16:02 Go to previous messageGo to next message
BlackSwan
Messages: 25050
Registered: January 2009
Location: SoCal
Senior Member
>So I was thinking that I can create a separate schema in the existing database.
NO. Charcter set settings are done at the database level NOT at the schema level.
It would be best if you simply created a new instance with the AL32UTF8 character set.
Re: Character Set [message #284104 is a reply to message #284075] Wed, 28 November 2007 22:25 Go to previous messageGo to next message
Arju
Messages: 1554
Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
Senior Member

Quote:

difference between WE8MSWIN1252 and AL32UTF8 character set


Standard ASCII characters require 1 byte of storage space under in WE8(...) and in AL32UTF8, however, other characters require only 1 byte of storage space in WE8(...), but they require 2 or
more bytes of space in AL32UTF8.
Re: Character Set [message #284137 is a reply to message #284075] Thu, 29 November 2007 00:15 Go to previous messageGo to next message
Michel Cadot
Messages: 64152
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Quote:

difference between WE8MSWIN1252 and AL32UTF8 character set?

All characters with code point < 128 in WE8MSWIN1252 have the same code point in AL32UTF8
All characters with code point >= 128 in WE8MSWIN1252 require 2 or 3 bytes in AL32UTF8.

Regards
Michel
Re: Character Set [message #284169 is a reply to message #284075] Thu, 29 November 2007 01:34 Go to previous messageGo to next message
Arju
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Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
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Can also be 4 bytes long.
Re: Character Set [message #284176 is a reply to message #284169] Thu, 29 November 2007 01:41 Go to previous messageGo to next message
Michel Cadot
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Not when origin is WE8MSWIN1252.
But you're right AL32UTF8 can be up to 4 bytes (and even 8 for extended Unicode).

Regards
Michel
Re: Character Set [message #285261 is a reply to message #284075] Tue, 04 December 2007 02:37 Go to previous messageGo to next message
trantuananh24hg
Messages: 668
Registered: January 2007
Location: Ha Noi, Viet Nam
Senior Member
@Michel:

Can I do these step following to change Database character set?

SQL> shutdown immediate
SQL> startup mount
SQL> alter system enable restricted session;
SQL> alter system set job_queue_processes=0;
SQL> alter system set aq_tm_processes=0;
SQL> alter database open;
.....
SQL> alter database character set internal_use AL32UTF8;
SQL> shutdown immediate
SQL> startup


Re: Character Set [message #285262 is a reply to message #284075] Tue, 04 December 2007 02:46 Go to previous messageGo to next message
Arju
Messages: 1554
Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
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No. First run csscan and then take decision.
Re: Character Set [message #285266 is a reply to message #285261] Tue, 04 December 2007 03:05 Go to previous messageGo to next message
Michel Cadot
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Registered: March 2007
Location: Nanterre, France, http://...
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NO

1/ This is not a supported way to do it internal_use says what it is: INTERNAL USE

2/ If you do this you lose your database

There is one and only one way: create a new database and export/import the data.

Regards
Michel
Re: Character Set [message #285272 is a reply to message #284075] Tue, 04 December 2007 03:12 Go to previous messageGo to next message
Arju
Messages: 1554
Registered: June 2007
Location: Dhaka,Bangladesh. Mobile:...
Senior Member

Don't use data pump export/import, use old export/import.
Re: Character Set [message #285490 is a reply to message #284075] Tue, 04 December 2007 21:53 Go to previous message
trantuananh24hg
Messages: 668
Registered: January 2007
Location: Ha Noi, Viet Nam
Senior Member
Thank you, Michel and Arju!

Your answer is very useful for my decision. The owner topic 's question is also same to me.

Thanks again!
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