设随机变量X与Y相互独立,且都服从区间(0,1)上的均匀分布,则P{X2+Y2≤1}=().
A.1/4
B.1/2
C.π/8
D.π/4
第1题
A.7
B.1
C.10
D.11
E.21
第2题
A. You cannot use IN operator in a condition that involves an outerjoin.
B. You use (+) on both sides of the WHERE condition to perform an outerjoin.
C. You use (*) on both sides of the WHERE condition to perform an outerjoin.
D. You use an outerjoin to see only the rows that do not meet the join condition.
E. In the WHERE condition, you use (+) following the name of the column in the table without matching rows, to perform an outerjoin.
F. You cannot link a condition that is involved in an outerjoin to another condition by using the OR operator.
第3题
A.IssuethegrantcommandfromtheSYSuser(orequivalent)ofthetargetdatabase.
B.IssuethegrantcommandfromtheSYSuser(orequivalent)oftherecovery-catalogdatabase.
C.Issuethegrantcommandfromtherecoverycatalog-owningschemauseraccountintherecoverycatalog.
D.IssuethegrantcommandfromRMANwhenconnectedtotherecoverycatalog-owningschema.
E.IssuethegrantcommandfromRMANwhenconnectedtothetargetdatabase.
第4题
A. ADD DIRECTORY
B. DROP DISK
C. RESIZE DISK
D. REBALANCE
E. ADD FAILGROUP
第5题
A.Therowmovementisnotenabledonthetable.
B.Thefirsttwoupdateswerenotexplicitlycommitted.
C.TheFlashbackVersionsQuerylistsonlythemostrecentupdate.
D.TheFlashbackVersionsQuerystopsproducingrowsafteritencountersatimeinthepastwhenthetablestructurewaschanged.
第6题
A.Thedatabaseinstanceisnotavailable.
B.TheALTERTABLEcommanddoesnothaveWAIToption
C.Thetableorarowinthetableiscurrentlylockedbyanotherusersession.
D.Thedatabaseinstanceisbusyprocessingotherusersessionscommands.
E.TheCUSTOMERStablehasnolongrunningqueryactiveatthetimewhenthisrequestismade.
F.TheserverprocessexecutingtheALTERTABLEcommandisbusywithanothercommandexecution
第7题
A. It must be executed from the Oracle Database 11g environment.
B. It must be executed only after the SYSAUX tablespace has been created.
C. It must be executed from the environment of the database that is being upgraded.
D. It must be executed only after AUTOEXTEND is set to ON for all existing tablespaces.
E. It must be executed from both the Oracle Database 11g and Oracle Database 9i environments.
第8题
A.a,b,c,d,e
B.b,a,d,c,e
C.b,c,d,a,e
D.b,c,d,e,a
E.b,d,c,a,e
第9题
A. CREATIVE USER susan;
B. CREATIVE OR REPLACE USER susan;
C. CREATE NEW USER susan DEFAULT
D. CREATE USER susan IDENTIFIED BY blue;
E. CREATE NEW USER susan IDENTIFIED BY blue;
F. CREATE OR REPLACE USER susan IDENTIFIED BY blue;
第10题
A.Transactionsarerolledbackusingredologfiles.
B.Transactionsarerolledforwardusingredologfiles.
C.Transactionsarerolledbackusingredologfilesandarchivedlogfiles.
D.Transactionsarerolledforwardusingredologfilesandrolledbackusingredologfiles.
为了保护您的账号安全,请在“上学吧”公众号进行验证,点击“官网服务”-“账号验证”后输入验证码“”完成验证,验证成功后方可继续查看答案!