Oracle Errors Question:
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ORA-12518: TNS:listener could not hand off client connection?

Answer:

Cause: The process of handing off a client connection to
another process failed.

Action: Turn on listener tracing and re-execute the
operation. Verify that the listener and database instance
are properly configured for direct handoff. If problem
persists, call Oracle Support.

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ORA-12519: TNS:no appropriate service handler found?ORA-12516: TNS:listener could not find available handler with matching protocol stack?