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．1／4B．1／2C．π／8D．π／4

A.7

B.1

C.10

D.11

E.21

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.

A.IssuethegrantcommandfromtheSYSuser（orequivalent）ofthetargetdatabase.

B.IssuethegrantcommandfromtheSYSuser（orequivalent）oftherecovery-catalogdatabase.

C.Issuethegrantcommandfromtherecoverycatalog-owningschemauseraccountintherecoverycatalog.

D.IssuethegrantcommandfromRMANwhenconnectedtotherecoverycatalog-owningschema.

E.IssuethegrantcommandfromRMANwhenconnectedtothetargetdatabase.

A. ADD DIRECTORY

B. DROP DISK

C. RESIZE DISK

D. REBALANCE

E. ADD FAILGROUP

A.Therowmovementisnotenabledonthetable.

B.Thefirsttwoupdateswerenotexplicitlycommitted.

C.TheFlashbackVersionsQuerylistsonlythemostrecentupdate.

D.TheFlashbackVersionsQuerystopsproducingrowsafteritencountersatimeinthepastwhenthetablestructurewaschanged.

CUST_NAMEcolumnoftheCUSTOMERStable：ALTERTABLEcustomersMODIFY（cust_nameVARCHAR2（40））/Whenyouexecutethecommand，itdisplaysthefollowingerrormessage：ERRORatline1：ORA-00054：resourcebusyandacquirewithNOWAITspecifiedWhatcouldbethereasonfortheerrormessage？（）

A.Thedatabaseinstanceisnotavailable.

B.TheALTERTABLEcommanddoesnothaveWAIToption

C.Thetableorarowinthetableiscurrentlylockedbyanotherusersession.

D.Thedatabaseinstanceisbusyprocessingotherusersessionscommands.

E.TheCUSTOMERStablehasnolongrunningqueryactiveatthetimewhenthisrequestismade.

F.TheserverprocessexecutingtheALTERTABLEcommandisbusywithanothercommandexecution

base. As a part of the upgrade process, you execute the following script:SQL>@utlu111i.sqlWhich statement about the execution of this script is true?（）

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.

Inwhatorderwouldyouexecutethefollowingstepstocreatearecoverycatalog？（）a.Issuethecreatecatalogcommand.b.Createtherecovery-catalogdatabase.c.Createtherecovery-cataloguser.d.Granttherecovery_catalog_ownerprivilegetotherecovery-cataloguser.e.Issuetheregisterdatabasecommandfromthetargetdatabase.

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

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;

A.Transactionsarerolledbackusingredologfiles.

B.Transactionsarerolledforwardusingredologfiles.

C.Transactionsarerolledbackusingredologfilesandarchivedlogfiles.

D.Transactionsarerolledforwardusingredologfilesandrolledbackusingredologfiles.