一种新型实时数据模型--钟面模型

A NEW REAL-TIME DATA MODEL—CLOCK DATA MODEL

动态的实时数据总是包含对应的时间信息,现有实时数据库技术没有充分考虑时间信息的建模问题;另一方面,大型实时数据库中数据存取效率的瓶颈在于磁盘的机械运动。提出了一种新型实时数据模型——钟面模型。建立了钟面模型与实时数据的时间属性之间的逻辑对应关系,分析了钟面模型与磁盘存储介质的圆柱状结构之间的逻辑对应关系,以及根据数据在逻辑钟面的偏移位置,确定数据在物理磁盘上的偏移位置的计算方法。初步研究结果表明基于钟面模型的实时数据模型及其对应的数据存取技术,可以减少磁盘的机械运动,缩短定位操作所消耗的时间,显著提高数据处理效率。

Real-time data always include important time information, and existing real-time database technologies do not include a complete data model. A novel real-time Clock Data Model is present. Logic relationship between Clock Data Model and the time information of real-time data is built. The model operators are studied. Direct logic relationship can be built between Clock Data Model and storage（disk）. Experimental results show that Clock Data Model and the relative data access technology can improve the efficiency of data processing strikingly.