Note the following statements that use flashback technology:1. FLASHBACK TABLE table TO SCN scn;2. SELECT * FROM table AS OF SCN 123456;3. FLASHBACK TABLE table TO BEFORE DROP;4. FLASHBACK DATABASE TO TIMESTAMP timestamp;5. SELECT * FROM table VERSIONS AS OF SCN 123456 AND 123999;Which of these statements will be dependent on the availability of relevant undo data in the undo segment?（）A. 1, 2, and 5B. 1, 3, and 4C. 2, 3, 4, and 5D. 1, 2, 3, 4, and 5
Note the following statements that use flashback technology:1. FLASHBACK TABLE <table> TO SCN <scn>;2. SELECT * FROM <table> AS OF SCN 123456;3. FLASHBACK TABLE <table> TO BEFORE DROP;4. FLASHBACK DATABASE TO TIMESTAMP <timestamp>;5. SELECT * FROM <table> VERSIONS AS OF SCN 123456 AND 123999;Which of these statements will be dependent on the availability of relevant undo data in the undo segment?（）
A. 1, 2, and 5
B. 1, 3, and 4
C. 2, 3, 4, and 5
D. 1, 2, 3, 4, and 5
相关考题：
On Friday at 11:30 am you decided to flash back the database because of a user error that occurred at 8:30 am. Which option must you use to check whether a flashback operation can recover the database to the specified time? （）A. Check the alert log fileB. Query the V$FLASHBACK_DATABASE_LOG viewC. Query the V$RECOVERY_FILE_DEST_SIZE viewD.Query the V$FLASHBACK_DATABASE_STAT viewE. Check the value assigned for the UNDO_RETENTION parameter
Notetheoutputofthefollowingquery；SQLSELECTflashback_archieve_name，statusFROMdba_flashback_archieve；FLASHBACK_ARCHIEVE_NAMESTATUSFLA1YouexecutedthefollowingcommandtoenableFlashbackDataArchiveontheEXCHANGB_PATEtable：ALTERTABLEexchange_rateFLASHBACKARCHIEVE；Whatistheoutcomeofthiscommand？（）A.ThetableusesthedefaultFlashbackDataArchive.B.TheFlashbackDataArchiveIscreatedIntheSYSAUXtablespace.C.TheFlashbackDataArchiveiscreatedinthesametablespacewherethetablesarestored.D.ThecommandgeneratesanerrorbecausenoflashbackDataArchivenameisspecifiedandthereis nodefaultFlashbackDataAchieve.
ThesearethedetailsaboutV$FLASHBACK_DATABASE_STAT：SQLDESCV$FLASHBACK_DATABASE_STATNameNull？Type-----------------------------------BEGIN_TIMEDATEEND_TIMEDATEFLASHBACK_DATANUMBERDB_DATANUMBERREDO_DATANUMBERESTIMATED_FLASHBACK_SIZENUMBERWhichtwostatementsregardingtheV$FLASHBACK_DATABASE_STATviewaretrue？（）A.BEGIN_TIMEisthetimeatwhichFlashbackloggingisenabled.B.END_TIMEisthetimeatwhichthequeryisexecutedontheview.C.REDO_DATAisthenumberofbytesofredodatawrittenduringtheinterval.D.Thisviewcontainsinformationaboutflashbackdatapertainingtothelast24hours.E.FLASHBACK_DATAistheamountofflashbackdatageneratedsincethedatabasewasopened.
YoudecidetoenableFlashbackDatabaseinyourOracle10gdatabasesothatfuturerecoverieswilltakelesstimethantraditionalrecoveries.WhichofthefollowingparametersmustbeincludedinyourinitializationparameterfilebeforeenablingFlashbackDatabase？（）A.DB_RECOVERY_FILE_DESTonlyB.DB_FLASHBACK_RETENTION_TARGETonlyC.DB_RECOVERY_FILE_DEST_SIZEandDB_RECOVERY_FILE_DESTonlyD.DB_RECOVERY_FILE_DESTandDB_FLASHBACK_RETENTION_TARGETonlyE.DB_RECOVERY_FILE_DEST_SIZE，DB_RECOVERY_FILE_DESTandF.DB_FLASHBACK_RETENTION_TARGET
YouareworkingasaDBAatNetFxCorporation.YoudiscoverthattheSCOTTschemaisdeletedbymistake.Youdecidetoflashthedatabasebacktothetimewhentheschemaexisted.Whichviewwillyouquerytodeterminetheestimatedsizeoftheflashbackdatathatyourequireforyourcurrenttargetretention？（）A.V$FLASHBACK_DATABASE_LOGB.V$FLASHBACK_DATABASE_STATC.V$DATABASED.V$UNDOSTAT
Youarerequiredtoflashbackyourdatabase.Youwanttofindtheamountofflashbackdatageneratedsincethedatabasewasopened.Whichtaskwillyouperformtoobtaintherequiredinformation?() A.QuerytheV$FLASHBACK_DATABASE_LOGview.B.QuerytheV$FLASHBACK_DATABASE_STATview.C.CheckthevalueoftheDB_FLASHBACK_RETENTION_TARGETinitializationparameter.D.QuerytheV$RECOVERY_FILE_DESTview.
YouaremaintainingtheSALESdatabaseforanorganization.YouhaveenabledtheFlashbackDatabasefeatureandwanttoestimatetheflashbackspacerequiredforfutureoperations.Whichviewwouldyouquerytoestimatetheflashbackspacerequired？（）A.V$DATABASEB.V$FLASHBACK_DATABASE_STATC.V$FLASHBACK_DATABASE_LOGD.V$RECOVERY_FILE_DEST
Youexecutedthefollowingqueryinyourdatabase:SELECToldest_flashback_scn,oldest_flashback_timeFROMV$FLASHBACK_DATABASE_LOG;Whatwouldyoudeterminefromthe output?() A.Thetimewhenthelastflashbackoperationinyourdatabasewasperformed.B.Thetimewhenthefirstflashbackoperationinyourdatabasewasperformed.C.AlistofflashbackoperationsperformedinyourdatabaseusingSCNandtime.D.Theapproximatetimeandthelowestsystemchangenumber（SCN）towhichyoucanflashbackyourdatabase.
下面哪2个参数是flashback databae必须设置的? () A. DB_FLASHBACK_RETENTION_TARGETB. DB_RECOVERY_FILE_DESTC. RECOVERY_PARALLELISMD. FLASHBACK_TRANSACTION_QUERYE. DB_RECOVERY_FILE_DEST_SIZE
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