ORA-12520

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Version 11g

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

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.

Version 10g

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

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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