To check the database:
#su – oracle
Verify that ORACLE_HOME and ORACLE_SID are set correctly.

Check status by command tnsping:
$tnsping ov_net

Check status by SQL query:

$ORACLE_HOME/bin/sqlplus /nolog
SQL> connect / as sysdba
SQL>

   1: set lines110

   2: col strtd hea 'STARTED'

   3: col instance_name for a8 hea 'INSTANCE'

   4: col host_name for a15 hea 'HOSTNAME'

   5: col version for a10

   6: select instance_name, version, host_name, status

   7: , database_status, to_char(startup_time,'DD-MON-YYYY HH:MI:SS') strtd

   8: from v$instance;

SQL> exit

Start the database:

$ORACLE_HOME/bin/sqlplus /nolog
SQL> connect / as sysdba
SQL> STARTUP MOUNT
SQL> exit

Usually default database setting is as below:
ORACLE_SID is [openview]
Password of Oracle user ‘system’ is [manager]
Oracle Service name is [ov_net]

Screenshot-1

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