单项选择题

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.

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单项选择题

Which naming method uses the tnsnames.ora file to store the connect descriptor used by the client
while connecting to the database instance from a remote machine（）

A.host naming method
B.local naming method
C.external naming method
D.directory naming method

多项选择题

Which two statements are true regarding listeners（）

A.Listeners use only the TCP/IP protocol.
B.Multiple listener processes can run simultaneously on a host.
C.Multiple database instances can be registered with a single listener.
D.The listener-related errors can be traced only at the administrative level.
E.Only one database instance can be registered with a single listener at any time.

多项选择题

A database user SMITH tries to query the V$SESSION view and fails to access it as follows： SQL> connect smith/smith
Connected.
SQL> SELECT * FROM v$session；
SELECT * FROM v$session *
ERROR at line 1：
ORA-00942： table or view does not exist
Which are the two possible solutions to enable SMITH to query the data in V$SESSION（）

A.granting SELECT privilege to SMITH on V$SESSION
B.granting SELECT privilege to SMITH on V_$SESSION
C.asking the user SMITH to run the catalog.sql script
D.granting SELECT privilege to SMITH on V$FIXED_TABLES
E.setting the O7_DICTIONARY_ACCESSIBILITY parameter to TRUE
F.creating a view based on V$SESSION and granting SELECT privilege to SMITH on the view that was created