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[主观题]

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

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

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更多“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”相关的问题

第1题

How many individual archive-log destination directories are supported by Oracle Database11g?()

A.7

B.1

C.10

D.11

E.21

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第2题

Which three are true regarding the use of outer joins? ()

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.

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第3题

HowwouldyougranttheRVPCuseraccesstospecificRMANdatabaserecordsintheRMANvirtualprivatecatalog?()

A.IssuethegrantcommandfromtheSYSuser(orequivalent)ofthetargetdatabase.

B.IssuethegrantcommandfromtheSYSuser(orequivalent)oftherecovery-catalogdatabase.

C.Issuethegrantcommandfromtherecoverycatalog-owningschemauseraccountintherecoverycatalog.

D.IssuethegrantcommandfromRMANwhenconnectedtotherecoverycatalog-owningschema.

E.IssuethegrantcommandfromRMANwhenconnectedtothetargetdatabase.

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第4题

Which of the following ALTER DISKGROUP commands does not use V$ASM_OPERATION to record thestatus of the operation?()

A. ADD DIRECTORY

B. DROP DISK

C. RESIZE DISK

D. REBALANCE

E. ADD FAILGROUP

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第5题

ViewtheExhibits.YouperformedoperationsontheDEPT4tableasshownintheExhibit.WhenyouperformtheFlashbackVersionsQuery,youfindthatthefirsttwoupdatesarenotlisted.Whatcouldbethereason?()

A.Therowmovementisnotenabledonthetable.

B.Thefirsttwoupdateswerenotexplicitlycommitted.

C.TheFlashbackVersionsQuerylistsonlythemostrecentupdate.

D.TheFlashbackVersionsQuerystopsproducingrowsafteritencountersatimeinthepastwhenthetablestructurewaschanged.

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第6题

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

A.Thedatabaseinstanceisnotavailable.

B.TheALTERTABLEcommanddoesnothaveWAIToption

C.Thetableorarowinthetableiscurrentlylockedbyanotherusersession.

D.Thedatabaseinstanceisbusyprocessingotherusersessionscommands.

E.TheCUSTOMERStablehasnolongrunningqueryactiveatthetimewhenthisrequestismade.

F.TheserverprocessexecutingtheALTERTABLEcommandisbusywithanothercommandexecution

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第7题

You installed Oracle Database 11g and are performing a manual upgrade of the Oracle9i data
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.

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第8题

Inwhatorderwouldyouexecutethefollowingstepstocreatearecoverycatalog?()a.Issuethecreatecata
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

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第9题

Which statement creates a new user? ()

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;

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第10题

YourbossatSupportcenter.cnwantsyoutoclarifyOracle10g.Whichstatementregardingtheusageofredologfilesduringinstancerecoveryistrue?()

A.Transactionsarerolledbackusingredologfiles.

B.Transactionsarerolledforwardusingredologfiles.

C.Transactionsarerolledbackusingredologfilesandarchivedlogfiles.

D.Transactionsarerolledforwardusingredologfilesandrolledbackusingredologfiles.

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