14配置跟使用恢复管理器.ppt

Incrementally Updating Backups With the Incrementally Updated Backups feature, you can use RMAN to apply incremental backups to data file image copies. With this recovery method, RMAN can recover a copy of a data file, or roll forward the image copy, to the specified point in time by applying the incremental backups. The image copy is updated with all changes up through the SCN at which the incremental backup was taken. RMAN can use the resulting updated image copy in media recovery just as it would use a full image copy taken at that SCN, without the overhead of performing a full image copy of the database or data file every day. Incrementally updating backups requires two different commands: Use the BACKUP INCREMENTAL LEVEL 1...FOR RECOVER OF COPY WITH TAG ... form of the BACKUP command to create incremental backups that can be incrementally updated. If an incremental level 0 backup does not already exist, then executing this command creates a level 0 backup with the specified tag. Apply any incremental backups to a set of data file copies with the same tag using the RECOVER COPY ...WITH TAG ... form of the BACKUP command. If there is no incremental backup or no data file copy, the command generates a message but does not generate an error. Tags must be used to identify the incremental backups and data file copies created for use in this strategy, so that they do not interfere with other backup strategies that you implement. LIST Command Use the RMAN LIST command to display information about backup sets, proxy copies, and image copies recorded in the repository. Use this command to list: Backups and copies that do not have the AVAILABLE status in the RMAN repository Backups and copies of data files that are available and can possibly be used in a restore operation Backup sets and copies that contain a backup of a specified list of data files or specified tablespaces Backup sets and copies that contain a backup of any archived logs with a specified name or rang