[root@DBserver01 ~]# su -oracle

[oracle@DBserver01 ~]$ sqlplus / as sysdba;

SQL> shutdown abort;ORACLE instance shut down.SQL> startupORACLE instance started.Total System Global Area 3256942592 bytesFixed Size                  2217752 bytesVariable Size            2449475816 bytesDatabase Buffers          788529152 bytesRedo Buffers               16719872 bytesDatabase mounted.Database opened.

SQL> exit

[oracle@DBserver01 ~]$ lsnrctl start