单项选择题
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.
单项选择题 Examine the following commands executed in your database： SQL> ALTER SESSION RECYCLEBIN=ON； Session altered SQL > CREATE TABLE emp TABLESPACE tbsfd AS SELECT * FROM hr.employees； Table created. Further， you executed the following command to drop the table： SQL> DROP TABLE emp；Table dropped. What happens in this scenario？（）
多项选择题 WhichtwostatementsaboutRecoveryManager（RMAN）backupsaretrue？（）
单项选择题 ThedatabaseusersareconnectingtothePRODdatabasefromdifferentapplications，therebydegradingthedatabaseperformance.Theseniordatabaseadministratorsuspectsthelargenumberofconcurrentconnectionstobethereasonforlowperformanceandasksyoutorestrictthenumberconcurrentconnectionsperdatabaseusertoone.Whichactionwouldyoutaketoachievethisobjective？（）