OCP-1Z0-052-V8.02-132题

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132. The tnsnames.ora file has an entry for the service alias ORCL as follows:

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 on the database node.

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.

Answer: C

答案解析：

当 SERVICE_NAME 填写不正确时，你可以 tnsping 通数据库实例，但是却无法连接到数据库实例，因为你填写错

的 SERVICE_NAME 并没有注册到 LISTENER 当中。

listener 是在 db server 上配置，凡是在 client 端要连接 db 都需要通过 listener。