修改数据库字符集

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

Total System Global Area   76619308 bytes
Fixed Size                   454188 bytes
Variable Size              58720256 bytes
Database Buffers           16777216 bytes
Redo Buffers                 667648 bytes
Database mounted.
SQL> ALTER SESSION SET SQL_TRACE=TRUE;

Session altered.

SQL> ALTER SYSTEM ENABLE RESTRICTED SESSION;

System altered.

SQL> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;

System altered.

SQL> ALTER SYSTEM SET AQ_TM_PROCESSES=0;

System altered.

SQL> ALTER DATABASE OPEN;

Database altered.

SQL> set linesize 120
SQL> ALTER DATABASE CHARACTER SET ZHS16GBK;
报错：
alter database character set zhs16gbk
ERROR at line 1:
ORA-12712: new character set must be a superset of old character set

# 使用INTERNAL_USE可以跳过超集的检查,ALTER DATABASE character set INTERNAL_USE

alter system disable restricted session   启用受限模式

SHUTDOWN IMMEDIATE
SQL> STARTUP

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