can not start the sqlplus

From: happy <>
Date: Sun, 9 Jan 2011 08:57:29 -0800 (PST)
Message-ID: <>

I started the sqlplus through :

but did not opened .
I tried :
oracle _at_ Homer /export/home/oracle/database>lsnrctl start

LSNRCTL for Solaris: Version - Production on 09-JAN-2011 18:56:08

Copyright (c) 1991, 2005, Oracle. All rights reserved.

TNS-01106: Listener using listener name LISTENER has already been started

oracle _at_ Homer /export/home/oracle/database>
oracle _at_ Homer /export/home/oracle/database>dbstart $ORACLE_HOME
oracle _at_ Homer /export/home/oracle/database>

oracle _at_ Homer /export/home/oracle/database>sqlplus scott/tiger_at_orcl

SQL*Plus: Release - Production on Sun Jan 9 18:56:59 2011

Copyright (c) 1982, 2005, Oracle. All Rights Reserved.

ORA-12514: TNS:listener does not currently know of service requested in connect

Enter user-name: Received on Sun Jan 09 2011 - 10:57:29 CST

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