1. ¡ÒáÓ˹´ÀÒÉÒä·Âº¹ oracle
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select * from v$NLS_PARAMETERS;
select * from nls_database_parameters where parameter ='NLS_CHARACTERSET';
select * from v$nls_parameters where PARAMETER like '%CHARACTERSET%';
select * from nls_session_parameters;
alter session set nls_date_format = 'yyyy/mm/dd hh24:mi:ss';
select distinct CLIENT_CHARSET from V$SESSION_CONNECT_INFO where
sid=sys_context('userenv','sid');
SQL> select * from v$nls_parameters where parameter='NLS_CHARACTERSET';
PARAMETER VALUE
-------------------- --------------------
NLS_CHARACTERSET TH8TISASCII
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SQL> select distinct OWNER, TABLE_NAME from DBA_TAB_COLUMNS where DATA_TYPE in
('NCHAR','NVARCHAR2', 'NCLOB');
SQL>SPOOL nlsnew.log
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 amrims character set TH8TISASCII;
SQL> alter database amrims national character set UTF8;
SQL> shutdown immediate;
SQL> startup;
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1 SQL Plus --> connect sys/sys_password as sysdba
2 update props$
set value$ = 'TH8TISASCII'
where name = 'NLS_CHARACTERSET';
3 stop database (º¹ windows ä» stop ·Õè service)
4 start database (º¹ windows ä» start ·Õè service) >Åͧ·´Êͺ´Ù (µÑÇÍÂèÒ§à»ç¹¢Í§
10g äÁè¹èÒµèÒ§¡Ñ¹)
--syntax
--ALTER DATABASE [<db_name>] CHARACTER SET <new_character_set>;
--ALTER DATABASE [<db_name>] NATIONAL CHARACTER SET <new_NCHAR_character_set>;
/*SQL> SHUTDOWN IMMEDIATE; -- or NORMAL
-- <do a full backup>
SQL> STARTUP MOUNT;
SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION;
SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
SQL> ALTER DATABASE OPEN;
SQL> ALTER DATABASE CHARACTER SET <new_character_set_name>;
SQL> SHUTDOWN IMMEDIATE; -- or NORMAL
SQL> STARTUP;
*/
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--Set NLS_CHARACTERSET
sqlplus / as sysdba;
SHUTDWON IMMEDIATE;
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER DATABASE OPEN;
ALTER DATABASE CHARACTER SET INTERNAL_USE TH8TISASCII; --this work
--ËÃ×Í ALTER DATABASE CHARACTER SET TH8TISASCII; --ãªéä´é㹡óշÕè set
language ·ÕèÁÕ¢¹Ò´¹éÍ¡ÇèÒÁÒÂѧ¢¹Ò´ãËè

2. SHUTDWON IMMEDIATE;
STARTUP;
--Set NLS_CHARACTERSET, NLS_NCHAR_CHARACTERSET
sqlplus / as sysdba;
SHUTDWON IMMEDIATE;
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER DATABASE OPEN ;
UPDATE props$ SET value$='TH8TISASCII' WHERE name IN ('NLS_CHARACTERSET',
'NLS_NCHAR_CHARACTERSET');
commit;
SHUTDWON IMMEDIATE;
STARTUP;
ËÃ×ÍÇÔ¸Õ¡ÒÃÃÇÁ·Ñé§ÊͧÍÂèÒ§à¢éÒ´éÇ¡ѹà»ç¹ statement à´ÕÂÇ
--Set NLS_CHARACTERSET áÅÐ Set NLS_CHARACTERSET, NLS_NCHAR_CHARACTERSET
sqlplus / as sysdba;
SHUTDWON IMMEDIATE;
STARTUP MOUNT;
ALTER SYSTEM ENABLE RESTRICTED SESSION;
ALTER DATABASE OPEN;
ALTER DATABASE CHARACTER SET INTERNAL_USE TH8TISASCII; --this work
UPDATE props$ SET value$='TH8TISASCII' WHERE name IN ('NLS_CHARACTERSET',
'NLS_NCHAR_CHARACTERSET');
commit;
SHUTDWON IMMEDIATE;
STARTUP;