起動している場合

[username@hostname ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mon DD 00:01:51 YYYY

Copyright (c) 1982, 2013, Oracle.  All rights reserved.


Connected to:
Oracle Database 11g EE Extreme Perf Release 11.2.0.4.0 - 64bit Production
With the Partitioning, Real Application Clusters, Automatic Storage Management, Oracle Label Security,
OLAP, Data Mining, Oracle Database Vault and Real Application Testing options

確認できる情報

バージョン
Storage Type: ASM(Automatic Storage Management)かどうか
RACかどうか
OLAPかOLTPかどうか

起動していない場合

[username@hostname ~]$ sqlplus / as sysdba

SQL*Plus: Release 11.2.0.4.0 Production on Fri Mon DD 00:01:51 YYYY

Copyright (c) 1982, 2013, Oracle.  All rights reserved.

Connected to an idle instance.

「Connected to an idle instance.」と表示される