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

ORA-12523
ORA-12523: TNS:listener could not find instance appropriate for the client
connection
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.
More details : Viste http://www.high-oracle.com/ora-12523/
More details : Viste http://www.high-oracle.com/ora-12523/
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