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Exploiting A History Database for Backup

机译:利用历史数据库进行备份

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摘要

Database systems provide media recovery by taking periodic backups and applying a recovery log to a backup to restore the failed media. A transaction-time database is one that retains multiple versions of data, recording with each version the time of the transaction that created it. Such a database provides access to historical versions based on transaction time, and permits reconstruction of timeslices representing the data that were valid at past times. This paper shows how a TSB-tree supported transaction-time database can also provide the backup function of media recovery. Thus, the same versions used for database history are used for database backup. The cost of taking a TSB-tree backup is comparable to that of a conventional differential backup. The media recovery cost, especially when the media failure is partial, e.g. a single disk page, will usually be lower.
机译:数据库系统通过进行定期备份并将恢复日志应用于备份以恢复发生故障的介质来提供介质恢复。事务时间数据库是保留多个数据版本的数据库,并记录每个版本的创建时间的事务时间。这样的数据库提供对基于交易时间的历史版本的访问,并允许重建表示过去时间有效数据的时间片。本文说明了TSB树支持的事务时间数据库如何还可以提供媒体恢复的备份功能。因此,用于数据库历史记录的相同版本将用于数据库备份。 TSB树备份的成本与常规差异备份的成本相当。介质恢复成本,尤其是在介质故障是局部故障(例如单个磁盘页面通常会更低。

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