Redhat上安裝Oracle 10g沒有設定字符集採用操作系統默認字符集:WE8ISO8859P1字符集修改:ZHS16GBK由於過程逆首先需要備份數據庫
2.查詢當前字符集
SQL> select * from nls_database_parameters where parameter='NLS_CHARACTERSET';
PARAMETER VALUE
---------------------------------------- ----------------------------------------
NLS_CHARACTERSET WE8ISO8859P1
3.關閉數據庫
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
4.啓動數據庫mount狀態
SQL> startup mount
ORACLE instance started.
Total System Global Area 205520896 bytes
Fixed Size 1266608 bytes
Variable Size 100666448 bytes
Database Buffers 100663296 bytes
Redo Buffers 2924544 bytes
Database mounted.
5.限制session
SQL> alter system enable restricted session;
System altered.
6.查詢相關參數並修改
SQL> show parameter job_queue_processes;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
job_queue_processes integer 10
SQL> show parameter aq_tm_processes;
NAME TYPE VALUE
------------------------------------ ----------- ------------------------------
aq_tm_processes integer 0
SQL> alter system set job_queue_processes=0;
System altered.
7.打開數據庫
SQL> alter database open;
Database altered.
8.修改字符集
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
出現錯誤提示新字符集必須老字符集超集也原來字符集新字符集子集再Oracle官方文檔上查詢字符集包含關係下面使用Oracle內部命令internal_use跳過超集檢查生產環境建議使用此方法
SQL> alter database character set internal_use ZHS16GBK;
Database altered.
9.查詢當前字符集
SQL> select * from nls_database_parameters where parameter='NLS_CHARACTERSET';
PARAMETER VALUE
---------------------------------------- ----------------------------------------
NLS_CHARACTERSET ZHS16GBK
10.關閉數據庫
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
11.啓動數據庫mount狀態
SQL> startup mount
ORACLE instance started.
Total System Global Area 205520896 bytes
Fixed Size 1266608 bytes
Variable Size 100666448 bytes
Database Buffers 100663296 bytes
Redo Buffers 2924544 bytes
Database mounted.
12.相關參數改回原來值
SQL> alter system set job_queue_processes=10;
System altered.
13.打開數據庫
SQL> alter database open;
Database altered.