Tns listener error:

Question

i was away from Oracle for around 6-7 months and now i am back in it.
i was trying to install Oracle 32-bit 10.2 on windows 2003 enterprise edition.
i installed it without any issues. i didnt enable to option on creating the default database which comes along with Oracle installation.
later after installation i created a database throught dbca (not manually).
once i created the database, i tried to log into the database through command line and faced a oaa-12154 error. i restarted the listener and even edited the listener.ora and tnsnames.ora files.
i also ran the netca and restarted the listener. i am confused as to what is causing the error the OracleServoceSID service is running
can someone please guide me as to what is going wrong?
^C:\Documents and Settings\Administrator>set oracle_sid=arvind^
^C:\Documents and Settings\Administrator>sqlplus "sys as sysdba"^
^SQL*Plus: Release 10.2.0.1.0 - Production on Sun Mar 8 00:35:22 2009^
^Copyright (c) 1982, 2005, Oracle. All rights reserved.^
^Enter password:^
^ERROR:^
^ORA-12154: TNS:could not resolve the connect identifier specified^
i went to lsnrctl and saw the status.
^LSNRCTL> status^
^Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=TCP)(HOST=oracle)(PORT=1521)))^
^STATUS of the LISTENER^
^------------------------^
^Alias LISTENER^
^Version TNSLSNR for 32-bit Windows: Version 10.2.0.1.0 - Produ^
^ction^
^Start Date 08-MAR-2009 00:03:57^
^Uptime 0 days 0 hr. 29 min. 40 sec^
^Trace Level off^
^Security ON: Password or Local OS Authentication^
^SNMP OFF^
^Listener Parameter File E:\oracle\product\10.2.0\db_1\network\admin\listener.o^
^ra^
^Listener Log File E:\oracle\product\10.2.0\db_1\network\log\listener.log^
^Listening Endpoints Summary...^
^ (DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=oracle)(PORT=1521)))^
^The listener supports no services^
^The command completed successfully^
contents of the listener.ora file:
^LISTENER =^
^ (DESCRIPTION_LIST =^
^ (DESCRIPTION =^
^ (ADDRESS = (PROTOCOL = TCP)(HOST = oracle)(PORT = 1521))^
^ )^
^ )^
contents of the sqlnet.ora file
^SQLNET.AUTHENTICATION_SERVICES= (NTS)^
^NAMES.DIRECTORY_PATH= (TNSNAMES)^
^NAMES.DIRECTORY_LOOKUP= (TNSNAMES, ONAMES)^
contents of the tnsnames.ora file
^ARVIND =^
^ (DESCRIPTION =^
^ (ADDRESS_LIST =^
^ (ADDRESS = (PROTOCOL = TCP)(HOST = oracle)(PORT = 1521))^
^ )^
^ (CONNECT_DATA =^
^ (SERVICE_NAME = arvind)^
^ )^
^ )^

Answer 1

I am new to Oracle and I have come accross this error earlier.
Try going to oracle base and start sqlplus from there.
If it still gives error, issue set ORACLE_SID=<yourSID> at the oracle base directory level and again try logging in through SQLPlus. That worked for me.