oracle数据库的字符集查询

oracle数据库的字符集查询 
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1、oracle server 端 字符集查询 
select userenv('language') from dual 
select * from v$nls_parameters; 


其中NLS_CHARACTERSET 为server端字符集 
NLS_LANGUAGE 为 server端字符显示形式 


2、查询oracle client端的字符集 
$echo $NLS_LANG 


3、server端字符集修改 
sqlplus / as sysdba
shutdown immediate; 
startup mount;

    ALTER SESSION SET SQL_TRACE=TRUE;
ALTER SYSTEM ENABLE RESTRICTED SESSION; 
ALTER SYSTEM SET JOB_QUEUE_PROCESSES=0; 
ALTER SYSTEM SET AQ_TM_PROCESSES=0; 
alter database open; 
ALTER DATABASE CHARACTER SET ZHS16GBK; 
提示我们的字符集：新字符集必须为旧字符集的超集，这时我们可以跳过超集的检查做更改： 
GBK: ALTER DATABASE character set INTERNAL_USE ZHS16GBK; 或
UTF8: ALTER DATABASE character set INTERNAL_USE AL32UTF8;

shutdown immediate; 
startup  
4、client端字符集修改 
在 /home/oracle与 /root用户目录下的.bash_profile中 
添加或修改 export NLS_LANG="AMERICAN_AMERICA.UTF8" 语句