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Granularity reduction in temporal document databases

机译:时态文档数据库中的粒度减少

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摘要

With rapidly decreasing storage costs, temporal document databases are now a viable solution in many contexts. However, storing an ever-growing database can still be too costly, and as a consequence it is desirable to be able to physically delete old versions of data. Traditionally, this has been performed by an operation called vacuuming, where the oldest versions are physically deleted or migrated from secondary storage to less costly tertiary storage. In temporal document databases on the other hand, it is often more appropriate to remove intermediate versions instead of removing the oldest versions. We call this operation granularity reduction. In this paper we describe the concept of granularity reduction, and present six strategies for selecting the document versions to eliminate. Three of the strategies have been implemented in the V2 temporal document database system, and in this context we discuss the cost of applying the strategies.
机译:随着存储成本的快速下降,临时文档数据库现​​在在许多情况下都是可行的解决方案。但是,存储不断增长的数据库仍然可能太昂贵,因此,需要能够物理删除旧版本的数据。传统上,这是通过称为清理的操作执行的,在此操作中,最旧的版本会被物理删除或从辅助存储迁移到成本较低的第三级存储。另一方面,在临时文档数据库中,删除中间版本而不是删除最旧的版本通常更为合适。我们称这种操作粒度减小。在本文中,我们描述了粒度减少的概念,并提出了选择要消除的文档版本的六种策略。在V2时态文档数据库系统中已经实现了三种策略,在这种情况下,我们讨论了应用这些策略的成本。

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