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A¡¢oracle server ¶Ë ×Ö·û¼¯²éѯ
select userenv(‘language’) from dual
ÆäÖÐNLS_CHARACTERSET Ϊserver¶Ë×Ö·û¼¯
NLS_LANGUAGE Ϊ server¶Ë×Ö·ûÏÔʾÐÎʽ
B¡¢²éѯoracle client¶ËµÄ×Ö·û¼¯
$echo $NLS_LANG
Èç¹û·¢ÏÖÄãselect ³öÀ´µÄÊý¾ÝÊÇÂÒÂ룬Çë°Ñclient¶ËµÄ×Ö·û¼¯ÅäÖóÉÓëlinux²Ù×÷ϵͳÏàͬµÄ×Ö·û¼¯¡£Èç¹û»¹ÊÇÓÐÂÒÂ룬ÔòÓпÉÄÜÊÇÊý¾Ý¿âÖеÄÊý¾Ý´æÔÚÎÊÌ⣬»òÕßÊÇoracle·þÎñ¶ËµÄÅäÖôæÔÚÎÊÌâ¡£
C¡¢server¶Ë×Ö·û¼¯ÐÞ¸Ä
*****************************************************************
*  ¸ü¸Ä×Ö·û¼¯²½Öè·½·¨(WE8ISO8859P1 --> ZHS16GBK)            *
*****************************************************************
SQL>
½«Êý¾Ý¿âÆô¶¯µ½RESTRICTEDģʽÏÂ×ö×Ö·û¼¯¸ü¸Ä£º
SQL> conn /as sysdba
Connected.
SQL> shutdown immediate;
Database closed.
Database dismounted.
ORACLE instance shut down.
SQL> startup mount
ORACLE instance started.
Total System Global Area  236000356 bytes
Fixed Size                   451684 bytes
Variable Size             201326592 bytes
Database Buffers           33554432 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 ZHS16GBK;
ALTER DATABASE CHARACTER SET ZHS16GBK
*
ERROR at line 1:
ORA-12712: new character set must be a superset of old character set
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ORACLE ²é¿´Óû§ÃÜÂëÐÞ¸Äʱ¼ä

SQL> show user
USER is "SYS"
SQL> create user t1 identified by t1;
create user t1 identified by t1
*
ERROR at line 1:
ORA-01920: user name 'T1' conflicts with another user or role name
SQL> drop user t1 cascade;
User dropped.
SQL> create user t1 identified by t1;
Us ......
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