SQL not connecting to Personal database - ORA-12203

I have just installed Oracle 8.1.7 Personal Edition which is required for my Graduate Database Mgmt course.
I am getting an ORA-12203 error when loging onto SQL Plus (part of the install instructions) Instructions say to leave the Host String blank. Only gives instructions for errors 27101 or 01034 and cannot seem to find a help or error index anywhere.
Please help so that I can continue or else drop the class in time to get my money back!!!!

Jana,
Your TNSNAMES.ORA file will be found in a path similar to this one:
C:\Oracle\Ora81\NETWORK\ADMIN
The file may looks similar to this:
ORA1 =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = xxx.xxx.xx.xxx)(PORT = 1521))
(CONNECT_DATA =
(SERVICE_NAME = ora1)
When you log on to SQL*PLUS try:
USERNAME: system
PASSWORD: manager
HOSTNAME: (leave blank)
If you still get an error, refer to your TNSNAMES.ORA file to see what your host name should be (in my example, it is ORA1).
If you still get an error after filling in the hostname, launch server manager (C:\Oracle\Ora81\BIN\SVRMGRL.EXE), then try to start the database:
SVRMGR> CONNECT INTERNAL
SVRMGR> STARTUP
Good luck,
Emily
[email protected]

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(c) Copyright 2000 Oracle Corporation. All rights reserved.
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I have no trouble connecting to a local database with a empty string in the OCIServerAttach call.
Thanks in anticipation.

ORA-12154: "Could not resolve service name"
ORA-12541: "No listener"
ORA-12154: "Could not resolve service name"
When you try to connect to your database through Developer, try using the connect_string you've been using with .world added to it (sometimes it's appended to your connect_string automatically, and if your sqlnet.ora file has NAMES.DEFAULT_DOMAIN and NAME.DEFAULT_ZONE set to anything other than 'world' then you may have to create a new sqlnet.ora file and set NAMES.DEFAULT_DOMAIN and NAME.DEFAULT_ZONE to world for it to work properly.
ORA-12541: "No listener"
You just need to verify that the listener is running and also is listening for the SID or CONNECT_DATA value being sent be PL/SQL Developer. For example, if the listener on your remote machine is listening for 'pl_sql' but when you try to connect to the remote database the PL/SQL Developer is sending a request to connect to 'plsql', then there is 'no listener' listening for 'plsql' and it fails. IF you can connect to the remote database via sqlplus, but then when you try it from PL/SQL Developer and it fails, that means the listener is in fact running, but not listening for the correct string being sent to it by the application.
Hope this helps.
Roy

SQL not connecting to Personal database - ORA-12203

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