oracle数据库更改字符集

在数据迁徙的时候需要使源和目标数据库的字符集、版本等信息统一……

这里是对一个数据库的设置，需要在两边进行同样的操作。

SYS@PROD1> select userenv('language') from dual;

USERENV('LANGUAGE')
----------------------------------------------------
AMERICAN_AMERICA.ZHS16GBK

SYS@PROD1> startup mount
ORACLE instance started.
Total System Global Area 638853120 bytes
Fixed Size 2255952 bytes
Variable Size 255853488 bytes
Database Buffers 373293056 bytes
Redo Buffers 7450624 bytes
Database mounted.

SYS@PROD1> ALTER SESSION SET SQL_TRACE=TRUE;
Session altered.
SYS@PROD1> ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0;
System altered.
SYS@PROD1> ALTER SYSTEM SET AQ_TM_PROCESSES=0;
System altered.
SYS@PROD1>
SYS@PROD1>
SYS@PROD1> ALTER SYSTEM ENABLE RESTRICTED SESSION;
System altered.

SYS@PROD1> alter database open;
Database altered.
SYS@PROD1> alter database character set internal_use WE8MSWIN1252;
Database altered.
SYS@PROD1> alter system disable restricted session;
System altered.
SYS@PROD1> execute sys.dbms_metadata_util.load_stylesheets;
PL/SQL procedure successfully completed.

SYS@PROD1> select userenv('language') from dual;
USERENV('LANGUAGE')
--------------------------------------------------------------------------------
AMERICAN_AMERICA.WE8MSWIN1252

查看已经更改，这里需要把之前修改的参数改回去：

SYS@PROD1> alter system set job_queue_processes=30 ;
System altered.
SYS@PROD1> alter system set AQ_TM_PROCESSES=1;

重启（实验环境下强制重启）
SYS@PROD1> startup force ;
ORACLE instance started.
Total System Global Area 638853120 bytes
Fixed Size 2255952 bytes
Variable Size 255853488 bytes
Database Buffers 373293056 bytes
Redo Buffers 7450624 bytes
Database mounted.
Database opened.

完成~