Oracle Errors Question:
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ORA-12519: TNS:no appropriate service handler found?


Cause: The listener could not find any available service
handlers that are appropriate for the client connection.

Action: Run "lsnrctl services" to ensure that the
instance(s) have registered with the listener, and are
accepting connections.

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ORA-12520: TNS:listener could not find available handler for requested type of server?ORA-12518: TNS:listener could not hand off client connection?