Multiple times port 1521 open in netstat
First of all, I'm a newbie concerning Oracle.
When a client is connected with the database, and the network has an error for whatever reason, port 1521 stays connected in "netstat" on the server.
When I connecting the client again, the port will be opened a second time. and so one.
After a while when other clients try to connect, they get the "ORA-12516: TNS Listener could not find" error.
Question 1: If the ports are still opened, is this then an Oracle error? I mean is it Oracle server which keeps the ports open?
Question 2: If it is an oracle error, how can I resolve this?
Many thanks in advance.
Paul
First of all you should understand what this tns error means:
ORA-12516: TNS:listener could not find available handler with matching protocol stack
Cause: None of the known and available service handlers for the given SERVICE_NAME support the client's protocol stack: transport, session, and presentation protocols.
Action: Check to make sure that the service handlers (e.g. dispatchers) for the given SERVICE_NAME are registered with the listener, are accepting connections, and that they are properly configured to support the desired protocols.
If you currently have user connections and then suddenly it stops working this could mean that the OS has reached some sort of overflow and it has run out of resources, so the listener stops bequeathing new connections and reports any further attempt as a connection error.
Please post the oracle version and specify the five version digits. It is important to apply the latest patchset available to avoid hitting known bugs. And prepare the listener and sqlnet.ora files to start tracing, this could be required for further analysis.
~ Madrid
http://hrivera99.blogspot.com/
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