修改oracle默认编码
查看oracle数据库字符集：
select userenv(‘language’) from dual;
修改过程：
SQL> shutdown immediate
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area 135337420 bytes
Fixed Size 452044 bytes
Variable Size 109051904 bytes
Database Buffers 25165824 bytes
Redo Buffers 667648 bytes
Database mounted.
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>alter database character set INTERNAL_USE UTF8
或者修改成zhs16gbk编码格式
SQL> alter database character set zhs16gbk
SQL> shutdown immediate //先关闭数据库，再开启使之字符集生效
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL>startup
