RE: Urgent! Change Character Set from WE8IS088591 to UTF8

In my opinion, it is not a good idea to change from WE8ISO8859P1 to UTF8. Even though, there are two methods (updating in props$ table in pre-oracle8 and using alter database in after 8) available to change the characterset, for these two methods to work correctly without introducing corruption, there are two pre-existing conditions.

1. The characterset 'from' should be a subset of the 'to' characterset.
2. Not just subset, also a byte by byte compatible subset. Meaning say if A is represented as hex value 65 in the 'from' characterset then 65 should be represented as 'A' in 'to' characterset too.

 In reality, as far as I know, going from ASCII to WE8ISO8859P? is the only one that will satisfy this.

 Thanks
Riyaj "Re-yas" Shamsudeen
Certified Oracle DBA
"Usual disclaimers apply"

                                                                                       
                       
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                    root_at_fatcity.        Subject:     RE: Urgent! Change Character Set 
from WE8IS088591 to    
                    com                  UTF8                                          
                       
                                                                                       
                       
                                                                                       
                       
                    02/14/01                                                           
                       
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How about:

SVRMGR> startup mount
SVRMGR> alter system ENABLE RESTRICTED SESSION; Statement processed.
SVRMGR> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0; Statement processed.
SVRMGR> ALTER DATABASE OPEN;
Statement processed.
SVRMGR> ALTER DATABASE CHARACTER SET ********; Statement processed
SVRMGR> ALTER DATABASE NATIONAL CHARACTER SET **********; Statement processed.
SVRMGR> shutdown immediate
SVRMGR> startup

Answer from this list some time ago :)

Br.
Jorma

> -----Original Message-----
> From: ext Martin Kendall [mailto:Martin.Kendall_at_Rubus.com]
> Sent: 14 February, 2001 13:21
> To: Multiple recipients of list ORACLE-L
> Subject: RE: Urgent! Change Character Set from WE8IS088591 to UTF8
>
>
> DO NOT do this in 8i as you will not be able to restart the database.
>
> Martin
>
> -----Original Message-----
> Sent: 14 February 2001 10:31
> To: Multiple recipients of list ORACLE-L
>
>
> i once hear someone said that:
> update sys.props$ set value='utf8' where name ='NLS_characterset';
> and it seems it do work,but not konw whether it is legal,and
> no experience
> in production database.
> ----- Original Message -----
> To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
> Sent: Wednesday, February 14, 2001 7:40 AM
>
>
> > I have a 8.1.6.0.0 database.
> >
> > What is the best way to change Character Set from
> WE8ISO8859P1 to UTF8
> >
> > from:
> > NLS_CHARACTERSET WE8ISO8859P1
> >
> > To:
> > NLS_CHARACTERSET UTF8
> >
> > Thanks
> >
> > Larry
> >
> >
> >
> > --
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