摘要： 针对What-if分析中的多版本更新管理需求，根据不同的假设更新实现技术，提出支持What-if分析的内存OLAP系统中的多版本更新策略，其中包括常规的递归假设更新和基于差值的多版本假设更新，采用预合并机制的delta记录合并算法来提高级联假设更新模式下的多版本What-if查询性能。实验表明，与常规的递归假设更新相比，该算法无论在减少多版本更新代价方面还是在减少整体What-if查询时间方面均有效。
关键词:
What-if分析,
假设更新,
假设更新数据视图,
级联假设更新
Abstract: This paper focuses on requirements of multi-version management in What-if analysis. Multi-version update policy is presented in main-memory OLAP system with What-if analysis support based on different hypothetical update techniques which includes traditional cascade multi-version update and multi-version update based on difference value delta tuples. Delta tuple pre-merge mechanism is proposed to improve the performance of cascade hypothetical version merging procedure. Performance experiment shows that the pre-merge hypothetical update can reduce both time cost of multi-version updates and total time cost of What-if queries remarkably compared with cascade multi-version update.
Key words:
What-if analysis,
hypothetical update,
hypothetical update data view,
cascade hypothetical update
中图分类号:
张 宇;张延松;. 支持What-if分析的OLAP多版本管理机制[J]. 计算机工程, 2010, 36(2): 70-72.
ZHANG Yu; ZHANG Yan-song ;. Multi-version Management Mechanism in OLAP with What-if Analysis Support[J]. Computer Engineering, 2010, 36(2): 70-72.