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【速搜问答】差异备份是什么

问答 admin 9个月前 (04-11) 162次浏览 已收录 0个评论

汉英对照:
Chinese-English Translation:

差异备份是指对上一次完整备份之后所有更改的数据作备份。备份过程能够识别出数据哪些数据被改变了,它就对哪些数据进行备份。

Differential backup refers to the backup of all changed data after the last full backup. The backup process can identify which data has been changed, and it will back up which data.

差异备份是指对上一次完整备份之后所有更改的数据作备份。备份过程能够识别出数据哪些数据被改变了,它就对哪些数据进行备份。

Differential backup refers to the backup of all changed data after the last full backup. The backup process can identify which data has been changed, and it will back up which data.

例如:我首先执行了一个完整备份把某个数据库备份了一下,然后我在这个数据库里面添加了一个表。然后我又进行差异备份,那么差异备份只备份这个数据库完整备份以后更改的数据,也就是只备份那个表。差异备份的优势是速度,备份数据库所需的时间很少,但差异备份要求事先已执行过一次完整备份。

For example: I first perform a full backup of a database, and then I add a table to the database. Then I do differential backup, so differential backup only backs up the data changed after the full backup of this database, that is, only backs up that table. The advantage of differential backup is speed. It takes less time to back up the database, but differential backup requires that a full backup has been performed in advance.

差异备份过程中,只备份有标记的那些选中的文件和文件夹。它不清除标记,既:备份后不标记为已备份文件,换言之,不清除存档属性。

During differential backup, only the marked selected files and folders are backed up. It does not clear the mark, that is, it does not mark the file as backed up after the backup, in other words, it does not clear the archive attribute.

差异备份所基于的是最近一次的完整数据备份。 差异备份仅捕获自该次完整备份后发生更改的数据。 差异备份所基于的完整备份称为差异的“基准”。 完整备份(仅复制备份除外)可以用作一系列差异备份的基准,包括数据库备份、部分备份和文件备份。 文件差异备份的基准备份可以包含在完整备份、文件备份或部分备份中。

Differential backup is based on the last full data backup. A differential backup captures only data that has changed since the full backup. The full backup on which the differential backup is based is called the “benchmark” of the differential. Full backup (except copy only backup) can be used as a benchmark for a series of differential backup, including database backup, partial backup and file backup. The base backup of file differential backup can be included in full backup, file backup or partial backup.

差异备份优点

Advantages of differential backup

与创建完整备份相比,创建差异备份的速度可能非常快。 差异备份只记录自差异备份所基于的完整备份后更改的数据。 这有助于频繁地进行数据备份,减少数据丢失的风险。 但是,在还原差异备份之前,必须先还原其基准。 因此,从差异备份进行还原必然要比从完整备份进行还原需要更多的步骤和时间,因为这需要两个备份文件。

Creating a differential backup can be very fast compared to creating a full backup. A differential backup records only data that has changed since the full backup on which the differential backup is based. This helps to backup data frequently and reduce the risk of data loss. However, before restoring a differential backup, you must restore its baseline. Therefore, restoring from a differential backup is bound to take more steps and time than restoring from a full backup, because it requires two backup files.

如果数据库的某个子集比该数据库的其余部分修改得更为频繁,则差异数据库备份特别有用。 在这些情况下,使用差异数据库备份,您可以频繁执行备份,并且不会产生完整数据库备份的开销。

Differential database backup is particularly useful if a subset of the database is modified more frequently than the rest of the database. In these cases, with differential database backup, you can perform the backup frequently without the cost of full database backup.

在完整恢复模式下,使用差异备份可以减少必须还原的日志备份的数量。

In full recovery mode, using differential backup can reduce the number of log backups that must be restored.


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