Oracle Errors Question:
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ORA-12510: TNS:database temporarily lacks resources to handle the request?

Answer:

Cause: The dispatchers appear to be busy handling other
requests.

Action: Attempt the connection again. If error persists, ask
the DBA to increase the number of dispatchers and/or
dispatchers' limit on number of connections/sessions that
they can accept.

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ORA-12511: TNS:service handler found but it is not accepting connections?ORA-12509: TNS:listener failed to redirect client to service handler?