What is the solution of the ORA-03121 error?

What is the solution of the error "ORA-03121: No interface driver connected. Function not performed"?

Maria Anderson

Published: 18 Oct 2005

What is the solution of the error "ORA-03121: No interface driver connected. Function not performed"?

This error means that either SQL Net is not installed properly or the connect string being used by your program to connect is not in the tnsnames.ora file.

First, check to see that SQL Net is installed on the client machine. If SQL Net is installed, ensure that the connect string used by the program is in the tnsnames.ora file on the client. For example, check to see if your program can connect with:

hr/hr@ORATST01

Ensure that the service name ORATST01 is defined in the tnsnames.ora file. This file can usually be found in the network/admin subdirectory where the Oracle client software is installed.

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Oracle hostname changed with upgrade The hostname changed due to a computer upgrade and cloning (Symantec Ghost) of the system. How do I make Oracle change where it's looking for the database?

Can't find tnsnames.ora and listener.ora files after reinstallation I reinstalled Oracle 10g at another location and removed all traces of the earlier installation. But I could not find the tnsnames.ora and listener.ora files at ORACLE_HOMEnetworkadmin.

Listener could not resolve SID I am new in Oracle. When I try to log in to Oracle SQL*Plus I get the error: "listener could not resolve SID given in connect description." If my computer name is "abc" for example, how do I set listener.ora and tnsnames.ora?

ConnString value for dblink syntax We have two different Oracle servers and I am trying to connect from one server to another server using dblink. I am using the syntax for creating the dblink as "create database link dblink_name connect to user_name identified by password using ConnString." Here, what value should I give in ConnString?

No errors in tnsnames.ora file While connecting to the database through Toad or SQL*Plus, the "TNS name could not be resolved" error is appearing. After checking the TNSNames.ora file, I confirmed that there is no error in it. What could be other possibilities for this error coming so frequently?

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