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ORA-12520: TNS:listener could not find available handler for
requested type of server



ORA-12520: TNS:listener could not find available handler for requested type of server..

Answer / guest

Cause: None of the known and available service handlers for
requested type of server (dedicated or shared) are
appropriate for the client connection.

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

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