The database is configured for automatic archive logging. Along with the other required parameters， this entry is in the initialization file：log_archive_dest2="SERVICE=standby_db1 MANDATORY REOPEN=600" From where does the database resolve standby_db1？（）

单项选择题RMANautomaticallypropagateinformationaboutthedatabasestructure，archivedredologs，backupsets，anddatafilecopiesintotherecoverycatalogfromthetargetdatabase’scontrolfile.Thisinformationcanalsobepropagatedtothecatalogmanuallybyusingthe（）command.

A.LIST
B.SWITCH
C.VALIDATE
D.CONFIGURE
E.RESYNC CATALOG
F.UPGRADE CATALOG

多项选择题WhichthreefeaturesareprovidedbyRecoveryManagerandNOTprovidedbyuser-managedbackupandrecovery？（）

A.Online backups.
B.Skipping unused block. 
C.Partial database backups.
D.Incremental block-level backup.
E.Detection of corrupted blocks during backup.

多项选择题WhichtwoSQL*Loaderinstructionsareusedtoassemblelogicalrecords？（）

A.WHEN
B.INFILE
C.CONTINUEIF
D.CONCATENATE
E.TRAILING NULLCOLS

单项选择题You have discovered that a disk failure occurred on DISK1 where the data files belonging to the SYSTEM and USER_DATA tablespaces is stored. The database is currently open and you need to recover the data files. You will restore the data files to DISK2. What is the correct sequence of RMAN commands to restore and recover the data files？（）

A.A
B.B
C.C
D.D

单项选择题Aftertherecoveryiscomplete，whichcommandshouldyouexecute？（）

A.ALTER DATABASE OPEN；
B.ALTER DATABASE CLEAR LOGFILE；
C.ALTER DATABASE OPEN RESETLOGS；
D.ALTER DATABASE OPEN NORESETLOGS；