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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.

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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

單項(xiàng)選擇題

Note the points about data dictionary views and dynamic performance views：
1.These are stored in the SYSTEM tablespace.
2.These are the based on the virtual tables.
3.These are owned by the SYSuser.
4.These can be queried by a normal user only if O7_DICTIONARY_ACCESSIBILTY parameter is set toTRUE.
5.V$FIXED_TABLE view can be queried to list the names of these views.
Which statements listed describe the data dictionary views（）

A.1 and 3
B.2，3，and 5
C.1，2，and 3
D.2，3，4，and 5

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Which two statements are true regarding listeners（）

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