OCP-1Z0-053-V13.02-193题

193.What is the purpose of the recover command? (Choose all that apply.)

A. Recover database datafiles from physical disk backup sets.

B. Recover required incremental backups from physical disk backup sets.

C. Recover required archived redo logs from physical disk backup sets.

D. Apply incremental backups to recover the database.

E. Apply archived redo logs to recover the database.

Answer: BCDE

答案解析：

参考：http://docs.oracle.com/cd/E11882_01/backup.112/e10643/rcmsynta2001.htm#RCMRF90238

A答案为restore命令。

Purpose

Use the RECOVER command to perform one of the following distinct tasks:

• Perform complete recovery of the whole database or one or more restored data files

• Perform point-in-time recovery of a database (DBPITR) or tablespace (TSPITR)

• Apply incremental backups to a data file image copy (not a restored data file) to roll it forward in time

• Recover a corrupt data block or set of data blocks within a data file

  Incremental Backups and Archived Redo Log Files

  Except for RECOVER BLOCK, RMAN can use both incremental backups and archived redo log files for recovery. RMAN uses the following search order:

  1. Incremental backup sets on disk or tape

  2. Archived redo log files on disk

  3. Archived redo log backups on disk

  4. Archived redo log backup sets on tape

  When RMAN chooses a destination to restore archived redo log files, it uses the following order of precedence:

  1. SET ARCHIVELOG DESTINATION

  2. The LOG_ARCHIVE_DEST_n parameter whose value is set to LOCATION=USE_DB_RECOVERY_FILE_DEST

  3. LOG_ARCHIVE_DEST_1

  RMAN can apply incremental backups to data files that were not restored from an incremental backup. If overlapping levels of incremental backup exist, then RMAN automatically chooses the level covering the longest period of time.