如果错误信息，请对照一下信息
如果提示：
ORA-12717: Cannot issue ALTER DATABASE NATIONAL CHARACTER SET when NCLOB, NCHAR
or NVARCHAR2 data exists
则更改使用以下语句:
ALTER DATABASE NATIONAL CHARACTER SET INTERNAL_USE AL16UTF16;
如果提示：
ORA-12712: new character set must be a superset of old character set
则更改使用以下语句:
ALTER DATABASE character set INTERNAL_USE ZHS16GBK;
如果提示：
ORA-12721: operation cannot execute when other sessions are active
则更改使用以下语句:
SHUTDOWN IMMEDIATE;
STARTUP MOUNT EXCLUSIVE;
如果提示：
ORA-01109: database not open
则更改使用以下语句:
ALTER DATABASE OPEN;
如果提示：
ORA-12719: operation requires database is in RESTRICTED mode
则更改使用以下语句:
ALTER SYSTEM ENABLE RESTRICTED SESSION;
转载▼