Modifying the character set of an Oracle Database

Source: Internet
Author: User
Environment: RHEL 3, Oracle Database 10g Enterprise Edition Release 10.1.0.3.0

SQL> connect sys/passwd @ db as sysdba;
SQL> col name for a30
SQL> col value $ for a30
SQL> select name, value $ from props $ where name like '% NLS % ';

Name value $
------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET WE8ISO8859P1
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH. MI. SSXFF AM

Name value $
------------------------------------------------------------
NLS_TIMESTAMP_FORMAT DD-MON-RR HH. MI. SSXFF AM
NLS_TIME_TZ_FORMAT HH. MI. SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH. MI. SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET UTF8
NLS_RDBMS_VERSION 10.1.0.3.0

20 rows selected.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.

Total System Global Area 235999352 bytes
Fixed Size 450680 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 bytes
Database mounted.

SQL> alter system enable restricted session;

System altered.

SQL> alter database open;

Database altered.

SQL> set linesize 120;
SQL> alter database character set zhs16gbk;
Alter database character set zhs16gbk
*
ERROR at line 1:
ORA-12712: new character set must be a superset of old character set

SQL> ALTER DATABASE character set INTERNAL_USE zhs16gbk; -- use INTERNAL_USE to skip superset check

Database altered.

SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> STARTUP
ORACLE instance started.

Total System Global Area 235999352 bytes
Fixed Size 450680 bytes
Variable Size 201326592 bytes
Database Buffers 33554432 bytes
Redo Buffers 667648 bytes
Database mounted.
Database opened.
SQL>
SQL> select parameter, value from nls_database_parameters -- where parameter = 'nls _ CHARACTERSET ';

PARAMETER VALUE
------------------------------------------------------------
NLS_LANGUAGE AMERICAN
NLS_TERRITORY AMERICA
NLS_CURRENCY $
NLS_ISO_CURRENCY AMERICA
NLS_NUMERIC_CHARACTERS .,
NLS_CHARACTERSET ZHS16GBK
NLS_CALENDAR GREGORIAN
NLS_DATE_FORMAT DD-MON-RR
NLS_DATE_LANGUAGE AMERICAN
NLS_SORT BINARY
NLS_TIME_FORMAT HH. MI. SSXFF AM

PARAMETER VALUE
------------------------------------------------------------
NLS_TIMESTAMP_FORMAT DD-MON-RR HH. MI. SSXFF AM
NLS_TIME_TZ_FORMAT HH. MI. SSXFF AM TZR
NLS_TIMESTAMP_TZ_FORMAT DD-MON-RR HH. MI. SSXFF AM TZR
NLS_DUAL_CURRENCY $
NLS_COMP BINARY
NLS_LENGTH_SEMANTICS BYTE
NLS_NCHAR_CONV_EXCP FALSE
NLS_NCHAR_CHARACTERSET UTF8
NLS_RDBMS_VERSION 10.1.0.3.0

20 rows selected.

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