Login as Oracle user
$ sqlplus / as sysdba
SQL> select * from v$version;
The command output is similar to the following information:
BANNER
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Oracle Database 11g Enterprise Edition Release 11.1.0.7.0 – 64bit Production
PL/SQL Release 11.1.0.7.0 – Production
CORE 11.1.0.7.0 Production
TNS for Linux: Version 11.1.0.7.0 – Production
NLSRTL Version 11.1.0.7.0 – Production
In the preceding information, 11.1.0.7.0 is the version of the Oracle database.
