TNS will not resolve DEMO

Question

i have a first time install, with the DEMO database. i try "sqlplus system/manager@DEMO" and TNS will not resolve. i started the appropriate listener, and it says it is listening to DEMO. i am not on a network, just using local machine. the tnsnames.ora, sqlnet.ora, and listener.ora files seem to be fine, any help?

Answer 1

This message says that Oracle can find the database with DNS that you have given.
With a tnsping, you can verify it.
Below, I have a problem with my listener but Oracle can resolve the DNS orcl.
C:\Documents and Settings\Nicolas>tnsping orcl
TNS Ping Utility for 32-bit Windows: Version 10.2.0.4.0 - Production on 09-JAN-2009 10:02:03
Copyright (c) 1997,  2007, Oracle.  All rights reserved.
Used parameter files:
C:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\sqlnet.ora
Used TNSNAMES adapter to resolve the alias
Attempting to contact (DESCRIPTION = (ADDRESS_LIST = (ADDRESS = (PROTOCOL = TCP)(HOST = ngerard)(PORT = 1521))) (CONNECT_DATA = (S
ERVER = DEDICATED) (SERVICE_NAME = orcl)))
TNS-12541: TNS:no listener
C:\Documents and Settings\Nicolas>You can see above the used parameter files :
C:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\sqlnet.ora
Oracle need to know the directory where to find the file that define the TNS.
The directory is thus :
C:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\
Normally, you find in this directory the file tnsnames.ora which makes the link between you DNS (ORCL) and the database.
Below a example on my computer :
ORCL =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = ngerard)(PORT = 1521))
    (CONNECT_DATA =
      (SERVER = DEDICATED)
      (SERVICE_NAME = orcl)
  )What you can do to help Oracle to find this file, is to add an environment variable TNS_ADMIN with this value C:\oracle\product\10.2.0\db_1\NETWORK\ADMIN\.
Restart the Oracle BI Administration Tool and normally, you're done !
Good luck