ORA-12516: TNS:listener could not find available handler
with matching protocol stack
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Answer / guest
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.
Please add more information about this Error
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