Whichtwostatementsaboutthebackgroundprocessofthedatabasewriteraretrue（）

A.ItispossibletohavemultipledatabasewritersinanOracleinstance.

B.Itwritesdirtybuffers，ifany，todatafileswheneveracheckpointoccurs.

C.Itwritesdirtybuffers，ifany，todatafileswheneveratransactioncommits.

D.Itwritesdirtybuffers，ifany，todatafilesbeforethelogwriter（LGWR）writes

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更多“Whichtwostatementsabouttheback…”相关的问题

第1题

Giventhescriptcreatescriptdb_backup_datafile_script{backupdatafileand1，and2plusarchivelogdeleteinput；}Run{executescriptdb_backup_datafile_scriptusing2；}Whatistheresultofrunningthiscommand？（）

A.ThescriptwillfailsinceyouinstructedRMANtobackuponlyonedatafileratherthantwo

B.Thescriptwillsuccessfullybackupdatafile3withouterror

C.Thescriptwillfailsinceitusesasubstitutionvariablewhichisnotsupported

D.Theexecutescriptcommandwillpromptforthevalueofand2sinceit’snotincludedinthecommand

E.Thescriptwillfailbecauseyoucannotusetheplusarchivelogcommandwhenbackingup

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第2题

Byusingthetransactionidentifierprovidedby（）foraparticularrowchange，youcanusetheFlashbackTransactionQuerytoseetheoperationperformedbythetransaction.

A.FlashbackTable

B.FlashbackDatabase

C.FlashbackVersionsQuery

D.theRMANREPORTcommand

E.theDBA_PENDING_TRANSACTIONSview

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第3题

Given the following steps, which would be the correct order to create a backup of an Oracle database in NOARCHIVELOG mode?（）1.shutdown immediate from RMAN2.Log into RMAN3.startup mount from RMAN4.backup database5.alter database open6.backup database plus archivelog delete input

A.2，3，1，4，5

B.2，1，3，6，5

C.1，3，5，4

D.2，1，3，5，6

E.2，1，3，4，5

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第4题

How can you reverse the effects of an ALTER DISKGROUP ... DROP DISK command if it has not yetcompleted?（）

A. Issue the ALTER DISKGROUP ... ADD DISK command.

B. Issue the ALTER DISKGROUP ... UNDROP DISKS command.

C. Issue the ALTER DISKGROUP ... DROP DISK CANCEL command.

D. Retrieve the disk from the Recycle Bin after the operation completes.