And also that any past history of the warehouse processing activity can be recovered; backup files should contain the data that has been deleted from the archive table.

而且要能够对过去仓库处理活动的任何历史加以恢复；备份文件应该包含从档案表中删除的数据。

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Online backup occurs either when any or all online table spaces are put into online backup mode by issuing a command Alter Tablespace ts_name Begin Backup.

通过执行命令“Alter Tablespace ts_name Begin Backup”，将任何或所有联机表空间置于联机备份模式来启动联机备份。

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