如果您所在的公司可能丢失灾难恢复所需的归档日志，那么使用渐进和增量映像将给您提供多一份保障。
If you work in the type of company that can lose archived logs required for disaster recovery, the presence of incremental and delta images gives you more things to misplace.
要了解DB 2UD b联机备份和恢复，就需要了解归档日志记录。
To understand the DB2 UDB online backup and recovery, you need to understand archive logging. There are three definitions of logs that we need to familiar with.
如果您选择使用归档日志记录，并执行联机备份和前滚恢复，那么您可以恢复到数据丢失最少的那个时间点，或者恢复到结束日志的时候。
If you choose to have archive logging, and do an online backup and roll forward recovery, you can recover to a point in time or to the end of the logs for the minimum loss of data.
当您同时查看或搜索活动数据和归档数据时，它就不太方便了，因为首先要将归档文件恢复到活动数据所在的系统。
When viewing and searching both active and archived data, it is inconvenient to have to first restore the archived files back into the system where the active data resides.
注意：应当始终对初始值和新值进行归档，以防需要恢复到初始值。
Note: It is always a good idea to document the original value and new value in case you need to change back to the original value.
注意：应当始终对初始值和新值进行归档，以防需要恢复到初始值。
Note: It is always a good idea to document the original value and new value in case you need to change back to the original value.
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