Oracle Errors Question:
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ORA-12511: TNS:service handler found but it is not accepting connections?

Answer:

Cause: The dispatchers notified the listener that they
temporarily do not accept new connections.

Action: Attempt the connection again. If error persists,
contact the DBA to check the state of the dispatchers and/or
ask him to increase the number of dispatchers.

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ORA-12513: TNS:service handler found but it has registered for a different protocol?ORA-12510: TNS:database temporarily lacks resources to handle the request?