--------------------------------------------数据库基本信息--------------------------------------------------------
*、查询oracle版本
select * from v$version;
*、查询oracle服务端字符集编码
select userenv('language') from dual;
*、修改oracle服务端字符集编码
http://blog.youkuaiyun.com/fred_yang2013/article/details/46679931
*、如果乱码了怎么办 ,不要急,看下面
https://my.oschina.net/u/2291124/blog/392174
*、查看oracle日志文件
SELECT MEMBER FROM v$logfile;