多项选择题

Which two statements about Flashback Query are true？（）

A.It is generated by using the redo log files.
B.It helps in row-level recovery from user errors.
C.It can be performed to recover ALTER TABLE statements
D.It fails when undo data pertaining to the transaction is overwritten.
E.The database has to be opened with the resetlogs option after performing Flashback Query.

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热门试题

单项选择题WhilesettingupanOracledatabaseforoneofyourcriticalapplications，youwanttoensurethatthedatabaseisbackedupatregularintervalswithoutyourintervention.Whatshouldyoudotoachievetheobjective？（）

A.configure the database to run in ARCHIVELOG mode
B.configure the Flash Recovery Area to enable automatic database backup
C.schedule the database backup using DBMS_JOB package after creating the database
D.schedule the database backup using Recovery Manager （RMAN）commands after creating the database
E.schedule the database backup using Database Configuration Assistant （DBCA）while creating the database

单项选择题AusercomplainsthathegetsthefollowingerrormessagerepeatedlyafterexecutingsomeSQLstatements.Theerrormessageforcestheusertologofffromandlogontothedatabasetocontinuehiswork.ORA-02392：exceededsessionlimitonCPUusage，youarebeingloggedoffWhichactionwouldyoutaketoincreasethesessionlimitonCPUusage？（）

A.Modify the profile assigned to the user.
B.Modify the roles assigned to the users.
C.Modify the object privileges assigned to the user.
D.Modify the system privileges assigned to the users.
E.Modify the value for the RESOURCE_LIMIT parameter in the parameter file.

单项选择题YoufindthatthedatabaseperformancedegradeswhileyoubackupthePRODdatabaseusingRecoveryManager（RMAN）.ThePRODdatabaseisrunninginsharedservermode.Thedatabaseinstanceiscurrentlyusing60%oftotaloperatingsystemmemory.Yoususpectthesharedpoolfragmentationtobethereason.Whichactionwouldyouconsidertoovercometheperformancedegradation？（）

A.Configure Java Pool to cache the java objects.
B.Configure Streams Pool to enable parallel processing.
C.Increase Shared Pool size to cache more PL/SQL objects.
D.Increase Database Buffer Cache size to increase cache hits.
E.Configure Large Pool to be used by RMAN and shared server.
F.Increase the total System Global Area （SGA） size to increase memory hits.

单项选择题WhichisthecorrectdescriptionofthesignificanceoftheORACLE_HOMEenvironmentalvariable？（）

A.It specifies the directory containing the Oracle software.
B.It specifies the directory containing the Oracle-Managed Files.
C.It specifies the directory for database files， if not specified explicitly.
D.It specifies the base directory of Optimal Flexible Architecture （OFA） .

多项选择题YourdatabaseisconfiguredinNOARCHIVELOGmode.Allthecontrolfileshavebeenlostduetoaharddiskfailurebutthedatafilesarenotlost.Youhavetheclosedwholedatabasebackupavailabletoyou.Whichtwostatementsaretrueinthisscenario？（）

A.The instance aborts.
B.The database cannot be recovered.
C.The database can be recovered by restoring the control files from the backup.
D.The database remains opened and you have to shut it down with the ABORT option.
E.The database can be restored till the point of the last closed whole database backup.