How to fix the Oracle error NNC-00001: maximum number of connections already open?

In this post, you’ll learn more about the Oracle ErrorNNC-00001: maximum number of connections already open with the details on why you receive this error and the possible solution to fix it.

Oracle Error Description

NNC-00001: maximum number of connections already open

Reason for the Error NNC-00001: maximum number of connections already open

Cause: All available name service connections are handling requests.

How to fix the Error NNC-00001: maximum number of connections already open ?

You can fix this error in Oracle by following the below steps

Action: If the problem occurs when running a name server, increase the values of names.max_open_connections. If the problem occurs in a client program, turn on tracing and re-execute the failing operation. If the error persists, contact Worldwide Customer Support.