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早期计算机决策支持系统(DSS)主要是围绕着计算机事务(交易)系统建立的,而以事务为导向的系统强调重视时效性、高速度、安全性,并且按照业务运用过程来组成,且操作性数据代表某时精确值的细节性数据,处理数据量小,日常操作频繁,而决策信息系统是以管理问题为导向,所处理的决策性数据表示一段时间值的综合性数据,数据的时间性强,且数据处理量大。由于操作性应用与决策性应用所需的应用环境和该环境中的数据结构都不同,因此早期决策支持系统面临着查询速度慢,不能满足随时产生的灵活查询需求,以及系统维护困难、效率低、实用性及可操作性差等一系列问题。而OLAP(On-Line Analytical Process-
Early Computer Decision Support System (DSS) was mainly built around computer transaction (transaction) system, and transaction-oriented system emphasizes timeliness, speed, security, and in accordance with the business process, and operational The data represent the detailed data of precise value at a certain time, the data amount is small and the daily operation is frequent. The decision information system is based on the management problem. The decision data processed represent the comprehensive data for a period of time, the timeliness of the data Strong, and data processing capacity. Because operational applications and decision-making applications require different application environments and data structures in the environment, early decision support systems are faced with slow query speeds, inability to meet the demand for flexible queries that arise anytime, and for system maintenance difficulties and inefficiencies , Practicality and poor operability and a series of problems. OLAP (On-Line Analytical Process-