Which four are true about the Archive (ARCn) processes?
A)They might be used during instance recovery.
B)They can create archivelogs.
C)They are always used during instance recovery.
D)They archive redo from an active redo log.
E)They are always used during media recovery.
F)They can ship redo automatically to standby databases
G)They might be used during media recovery.
Answer: BDFG
趙：
AC 錯，ARCn 的作用是在日誌切換髮生時把切換後的重做日誌文件複製到歸檔日誌文件，與實例恢復沒有關係。
E 錯，不是一直。只有在數據文件損壞、在線日誌文件損壞等情況發生時，才用介質恢復。
F 譯：它們可以自動將重做發送到備用數據庫。