Hello friends,

i m trying to input user : scott and pass : tiger
also trying user : system pass : manager

but even though its not going to start. i m getting following error

SQL*Plus: Release

ERROR: ORA-12154: TNS:could not resolve service name

Enter user-name:
Enter password:
ERROR: ORA-03121: no interface driver connected - function not performed

Enter user-name:

please help me to solve this problem

9 Years
Discussion Span
Last Post by debasisdas

to solve your problem i need few information from you.

1. is the database installed on your PC ?
2. are you trying to log in to a database in a network ?
3.is the scott user exists and and is unlocked ?


This error

ERROR: ORA-12154: TNS:could not resolve service name

only appears when you don't have an instance of a database or you don't have the listener on.

Make sure you have the DB online and the listener.

You can view the listener status with: 'lsnrctl status' and start it with 'lsnrctl start'.

When the listener is running, you can enter as sysdba (defined when the DB is installed) and type an 'startup' command to start the database you have define. Use 'startup db_sid' if you have more than one.

Hope it helped.


check scott is unlock or not ............
& for system ...........
did you change the password at the time of installation or not.......


At the end of instalation programs diplay a screen with name password managemant. You just go to password management screen anf unblock all the users anf=d just fix your user and password.


Hey this is surely a problem of uncloking the users bt once check out if u have enabled the serices of oracle installed


Er guys, SqlPlus Isn't this from the days of Oracle 7?

I would think we would need to know more about your config before we could really help!

client / server, versions of oracle and client, where components are installed etc.

Your error suggests that the oracle client components are not installed / not in the path / wrong oracle_home selected - to name but a few possibilities!



Oracle 11g sql plus it show account is locked it showing enter user name &password

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