TNS-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.
Please add more information about this Error
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