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Maintaining temporal consistency of discrete objects in soft real-time database systems

机译：在软实时数据库系统中保持离散对象的时间一致性

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摘要

A real-time database system contains base data items which record and model a physical, real-world environment. For better decision support, base data items are summarized and correlated to derive views. These base data and views are accessed by application transactions to generate the ultimate actions taken by the system. As the environment changes, updates are applied to base data, which subsequently trigger view recomputations. There are thus three types of activities: base data update, view recomputation, and transaction execution. In a real-time database system, two timing constraints need to be enforced. We require that transactions meet their deadlines (transaction timeliness) and read fresh data (data timeliness). In this paper, we define the concept of absolute and relative temporal consistency from the perspective of transactions for discrete data objects. We address the important issue of transaction scheduling among the three types of activities such that the two timing requirements can be met. We also discuss how a real-time database system should be designed to enforce different levels of temporal consistency.
机译：实时数据库系统包含基础数据项，这些基础数据项记录并建模了一个实际的实际环境。为了提供更好的决策支持，对基本数据项进行汇总并进行关联以得出视图。应用程序事务访问这些基本数据和视图，以生成系统采取的最终操作。随着环境的变化，更新将应用于基础数据，随后触发视图重新计算。因此，活动分为三种：基本数据更新，视图重新计算和事务执行。在实时数据库系统中，需要强制执行两个时序约束。我们要求交易在截止日期（交易及时性）上进行，并读取新数据（数据及时性）。在本文中，我们从离散数据对象的事务处理角度定义了绝对和相对时间一致性的概念。我们解决了三种活动中事务调度的重要问题，以便可以满足两个时间要求。我们还将讨论应如何设计实时数据库系统以实施不同级别的时间一致性。

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