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首页> 外文期刊>Journal of Intelligent Information Systems >Active rule base development for dynamic vertical partitioning of multimedia databases
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Active rule base development for dynamic vertical partitioning of multimedia databases

机译：主动规则库开发，用于多媒体数据库的动态垂直分区

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摘要

Currently, vertical partitioning has been used in multimedia databases in order to take advantage of its potential benefits in query optimization. Nevertheless, most vertical partitioning algorithms are static; this means that they optimize a vertical partitioning scheme (VPS) according to a workload, but if this workload suffers changes, the VPS may be degraded, which would result in long query response time. This paper presents a set of active rules to perform dynamic vertical partitioning in multimedia databases. First of all, these rules collect all the information that a vertical partitioning algorithm needs as input. Then, they evaluate this information in order to know if the database has experienced enough changes to trigger a performance evaluator. In this case, if the performance of the database falls below a threshold previously calculated by the rules, the vertical partitioning algorithm is triggered, which gets a new VPS. Finally, the rules materialize the new VPS. Our active rule base is implemented in the system DYMOND, which is an active rule-based system for dynamic vertical partitioning of multimedia databases. DYMOND's architecture and work-flow are presented in this paper. Moreover, a case study is used to clarify and evaluate the functionality of our active rule base. Additionally, authors of this paper performed a qualitative evaluation with the aim of comparing and evaluating DYMOND's functionality. The results showed that DYMOND improved query performance in multimedia databases.
机译：当前，垂直分区已在多媒体数据库中使用，以便利用其在查询优化中的潜在优势。但是，大多数垂直分区算法都是静态的。这意味着他们根据工作负载优化了垂直分区方案（VPS），但是如果此工作负载遭受更改，则VPS可能会降级，这将导致较长的查询响应时间。本文提出了一套在多媒体数据库中执行动态垂直分区的活动规则。首先，这些规则收集垂直分区算法需要作为输入的所有信息。然后，他们评估此信息，以便知道数据库是否经历了足以触发性能评估器的更改。在这种情况下，如果数据库的性能下降到该规则先前计算的阈值以下，则会触发垂直分区算法，从而获得新的VPS。最后，这些规则实现了新的VPS。我们的活动规则库在系统DYMOND中实现，该系统是一个基于活动规则的系统，用于多媒体数据库的动态垂直分区。本文介绍了DYMOND的体系结构和工作流程。此外，还通过案例研究来阐明和评估我们活动规则库的功能。此外，本文的作者进行了定性评估，目的是比较和评估DYMOND的功能。结果表明，DYMOND提高了多媒体数据库中的查询性能。

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