ORA-12523: TNS:listener could not find instance appropriate
for the client connection



ORA-12523: TNS:listener could not find instance appropriate for the client connection..

Answer / guest

Cause: The listener could not find any available (database)
instances, that are appropriate for the client connection.

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

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