Which two SQL*Loader instructions are used to assemble logical records？（）

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；

单项选择题Whileconnectedtothedatabase，auseronaPCreceivesafatalerrorandthemachinereboots.Whichbackgroundprocesscleansupthefailedconnection？（）

A.ARCn
B.CKPT
C.DBWn
D.LGWR
E.PMON
F.SMON

多项选择题YounoticethatyourRMANscriptusedtocopythedatafiles，controlfiles，andarchivedredologfilesisperformingveryslowly.WhichtwochangesmightyouwanttoincludeinyourRMANscripttospeeduptheCOPYcommands？（）

A.NOCHECKSUM
B.MAXCORRUPT
C.CHECK LOGICAL
D.BACKUP INCREMENTAL
E.CONFIGURE DEVICE TYPE ... PARALLELISM

单项选择题Whichstatementistrueregardingremotearchivelogfiledestinations？（）

A.Only two destinations per remote database can be specified.
B.Destination is an Oracle Net alias specified by using the SERVICE keyword.
C.The REOPEN attribute must be used when using remote archive log file destinations.
D.The service name is resolved by searching sqlnet.ora file for the remote database name.