方法一：登录时会显示版本号
[oracle@ogg1 ~]$ sqlplus / as sysdba
SQL*Plus: Release 11.2.0.3.0 Production on 骀涓 7?20 17:51:14 2015
Copyright (c) 1982, 2011, Oracle. All rights reserved.
方法二：
SQL> select * from v$version;
BANNER
--------------------------------------------------------------------------------
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
PL/SQL Release 11.2.0.3.0 - Production
CORE 11.2.0.3.0 Production
TNS for Linux: Version 11.2.0.3.0 - Production
NLSRTL Version 11.2.0.3.0 - Production
Oracle一些比较常用的命令
原文：http://blog.51cto.com/sf1314/2083408
