时态数据库系统设计中的时间因素处理

TIME PROCESSING METHOD IN THE DESIGN OF TEMPORAL DATABASE SYSTEM

分析了数据处理中的３种时间及处理方法，讨论了ＴＤＢ的离散时间模型、时间粒度、时制与历法，引入了变粒度时间轴同步矩阵、时段－位移表达式及其物理存储格式等概念．通过与ＯＳ及ＤＢＭＳ的传统格式比较，表明这种表达方式有良好的时空效率、跨度与精度表达能力和运算效率。

This paper analyses three kinds of times and processing methods in DBMS ,discusses the discrete time model in TDB(Temporal DataBase ),the time granularity,clock system and calendars,Itproposes new concepts such as the time axis with variant granularity, synchonization matrix , time offset-segment expression and its storage format .Comparing with OS and ordinal DBMS.it shows thatthis expression is efficient in time and space while it has enough accuracy and span.