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Handling Expiration of Multigranular Temporal Objects

机译:处理多粒度时间对象的过期

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摘要

A well-known problem of temporal databases is that the amount of stored data tends to increase very fast. Moreover, detailed data are useful when they are acquired but they often become less relevant after some time. In most cases, after a period of time only summarized data need to be kept, whereas detailed data expire and can be removed from the database. Multigranular temporal databases enhance the expressive power of temporal databases by supporting temporal attributes at different levels of detail. However, in existing approaches the level of detail of an attribute, that is its granularity, depends only on the attribute semantics and does not depend on how recent the attribute values are. This paper proposes an approach supporting the aggregation of different portions of the value of a temporal attribute at different levels of detail, and the deletion or the transfer to tertiary storage of old values at a given level of detail, in order to minimize disk storage occupancy. In the proposed multigranular temporal object-oriented data model, the expiration of attribute values at a given granularity can be specified, together with the action to take when data expire: either aggregation to a coarser granularity, or deletion of values, or both.
机译:时态数据库的一个众所周知的问题是存储的数据量趋于非常快速地增加。此外,获取详细数据很有用,但是一段时间后它们通常变得不那么重要。在大多数情况下,经过一段时间后,仅需要保留摘要数据,而详细数据将过期并可以从数据库中删除。多粒度时态数据库通过支持不同详细程度的时态属性来增强时态数据库的表达能力。但是,在现有方法中,属性的详细程度(即其粒度)仅取决于属性的语义,而不取决于属性值的最新程度。本文提出了一种方法,该方法支持在不同详细程度下汇总时间属性值的不同部分,并在给定详细程度下将旧值删除或转移到第三级存储,以最大程度地减少磁盘存储占用率。在提出的多粒度时间面向对象的数据模型中,可以指定给定粒度下的属性值的到期时间,以及数据过期时采取的措施:聚集到较粗粒度的粒度,或值的删除,或两者。

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