【摘要】 <正> 1.引言数据仓库技术研究如何将分散在企业内部多个异构数据源的操作型数据,经过抽取、清洗转换、集成,以一致的方式进行存储。其实现多基于关系技术,数据被分别存放在维表和事实表之中,以星型或雪花模式存储。而OLAP(联机分析处理)技术则将数据仓库中的数据以多维方式进行组织并提更多还原

【Abstract】 Dimensions are an essential part in multi-dimensional data model (MDDM) for OLAP. Hierarchical structure of dimension allows the user to study measures in different levels of details. This paper focuses on a special kind of dimension with an unbalanced-hierarchy designed to support self-referencing dimension table in data warehouses, called recursive dimension, which is largely ignored by research area. So we extend MDDM to represent it and corresponding operations. Finally we show how it can be implemented in object-relational DBMS environment.更多还原