oracleユーザで入って、
$ cd $ORACLE_HOME/bin
$ sqlplus /nolog
SQL> connect / as sysdba
SQL> startup
ORACLE instance started.
Total System Global Area 536870912 bytes
Fixed Size 1220460 bytes
Variable Size 155189396 bytes
Database Buffers 373293056 bytes
Redo Buffers 7168000 bytes
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SQL> select status from v$instance;
STATUS
------------
OPEN
SQL> exit
$ ./lsnrctl start
$ ./lsnrctl status ＜確認
