What Is Lurking in Your Backups?

What Is Lurking in Your Backups?
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您的备份中潜藏着什么?

DOI:
10.1007/978-3-030-78120-0_26
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发表时间:
2021
期刊:
IFIP International Conference on ICT Systems Security and Privacy Protection
影响因子:
--
通讯作者:
Wagner, James
Wagner, James
中科院分区:
--
文献类型:
--
作者:
Lenard, Ben;Rasin, Alexander;Scope, Nick;Wagner, James

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数据管理和隐私方面的最佳实践要求旧数据必须被不可逆转地销毁。但是,由于性能优化的原因,旧的(删除或更新的)数据不会立即从活动数据库存储中清除。通常通过备份表和索引页(而不是逻辑行)来进行的数据库备份大大加剧了旧的幸存数据的隐私问题。将这些已删除的数据备份到备份中,确保未知数量的旧数据可以无限期地存储在本文中,我们量化了四个主要的代表性数据库中保留的已删除数据的数量,比较默认行为与显式碎片整理操作。我们回顾了这些数据库中可用的碎片整理选项,并讨论了它们对从备份中消除旧数据的影响。我们证明了每个数据库都有一个碎片整理机制,可以消除大部分旧的删除数据(尽管在Oracle中,更新前的内容可能会在碎片整理中幸存下来)。最后,我们概述了组织在决定是否在执行备份之前应用碎片整理时应该考虑的因素。
Best practices in data management and privacy mandate that old data must be irreversibly destroyed. However, due to performance optimization reasons, old (deleted or updated) data is not immediately purged from active database storage. Database backups that typically work by backing up table and index pages (rather than logical rows) greatly exacerbate the privacy problem of the old surviving data. Copying such deleted data into backups ensures that unknown quantities of old data can be stored indefinitely.In this paper, we quantify the amount of deleted data retained in backups by four major representative databases, comparing the default behavior versus an explicit defrag operation. We review the defrag options available in these databases and discuss the impact they have on eliminating old data from backups. We demonstrate that each database has a defrag mechanism that can eliminate most of old deleted data (although in Oracle pre-update content may survive defrag). Finally, we outline the factors that organizations should consider when deciding whether to apply defrag prior to executing their backups.
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