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单选题
Your tnsnames.ora file has the following entry for the service alias ORCL:  ORCL =  (DESCRIPTION =  (ADDRESS = (PROTOCOL = TCP) (HOST = 10.156.24.216) (PORT = 1521))   (CONNECT_DATA =  (SERVER = DEDICATED) (SERVICE_NAME = orcl.oracle.com)   )   )   The TNSPING command executes successfully when tested with ORCL but you are not able to connect to the database instance with the following command:  SQL> CONNECT scott/tiger@orcl  What could be the reason for this?()
A

The listener is not running at the server.

B

The TNS_ADMIN environmental variable is set to a wrong value.

C

The orcl.oracle.com database service is not registered with the listener.

D

The DEFAULT_DOMAIN parameter is set to a wrong value in the SQLNET.ORA file.


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