ORA-12560: TNS:protocol adapter error

[umesh049]

Hi i install oracle on my system but getting this error

C:\Documents and Settings\umesh>sqlplus sys/123456 as sysdba
 
SQL*Plus: Release 10.1.0.2.0 - Production on Tue Feb 19 11:51:32 2008
 
Copyright (c) 1982, 2004, Oracle.  All rights reserved.
 
ERROR:
ORA-12560: TNS:protocol adapter error
 
 
and
 
 
C:\Documents and Settings\umesh>tnsping orcl
 
TNS Ping Utility for 32-bit Windows: Version 10.1.0.2.0 - Production on 19-FEB-2008 12:15:21
 
Copyright (c) 1997, 2003, Oracle.  All rights reserved.
 
Used parameter files:
E:\Oracle\product\10.1.0\Client_2\network\admin\sqlnet.ora
 
TNS-03505: Failed to resolve name

thanks

[debasisdas]

If you have multiple databases in the system ,need to specify the name of the database also to connect.