Which component of the Oracle networking architecture provides character set and data type conversion between different character sets on the client and server？ （）

多项选择题SQL*Loaderisautilitythatcanperformwhichtwotasks？（）

A.Load data from a disk， tape， or named pipes.
B.Load data into an Oracle database using DML statements.
C.Extract， reorganize， and insert data within an Oracle database.
D.Load data from external files into tables in an Oracle database.
E.Load data into an Oracle database using operating system commands.
F.Load data directly from a non-Oracle database to an Oracle database.

多项选择题Inwhichthreesituationsisincompleterecoveryrequired？（）

A.After a shutdown abort.
B.When recovering to an SCN.
C.When recovering until a specific time.
D.When a required archived log is missing.

单项选择题AfterrunningtheCONFIGURERETENTIONPOLICYTORECOVERYWINDOWOF7DAYScommand，whathasbeenaccomplished？（）

A.Retain the data file backup for 7 days.
B.Run the recover process every 7 days.
C.Destroy the physical backup files every 7 days.
D.Destroy the physical backup files older than 7 days.
E.Retain one backup of each data file for at least 7 days.
F.Keep the catalog information in the control file for 7 days.

单项选择题You experience a loss of the disk on which the USER_DATA tablespace data files are stored. You attempt to recover the data files but discover that the archived redo log file with sequence number 45， which is needed to perform complete recovery， is invalid. You then begin incomplete recovery-You receive this prompt：  ORA-00279：change 309012...03 09 01 11：33：56 needed for thread ORA-00289： suggestion ：   disk1 archive arch_45.rdo ORA-00280： change 309012 for thread 1 is in sequence #45 Specify log：  {=suggested | filename | AUTO | CANCEL}  What is the correct response？（）

A.Enter the keyword AUTO.
B.Enter the keyword CANCEL.
C.Press the Enter or Return key.
D.Provide the filename ’/disk1/archive/arcg_46.rdo’

多项选择题WhichtwoRMANcommandsinitiatearesynchronizationoftherecoverycatalogwiththetargetdatabasecontrolfile？（）

A.COPY
B.BACKUP
C.CHANGE
D.DELETE
E.CATALOG