单项选择题
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.
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（）
多项选择题 Whichtwostatementsaretrueregardinglisteners（）
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（）
