Recently, a set of significant new concepts and tools have evolved into a new technology that makes it possible to attack the problem of providing all the key people in the enterprise with access to whatever le
OLAP queries involve a lot of aggregations on a large amount of data in data warehouses. To process expensive OLAP queries efficiently, we propose a new method to rewrite a given OLAP query using various kinds of materialized views which already exist in data warehouses. We first define the ...
HOLAP servers allows to store the large data volumes of detailed information. The aggregations are stored separately in MOLAP store.Specialized SQL ServersSpecialized SQL servers provide advanced query language and query processing support for SQL queries over star and snowflake schemas in a read-only...
OLAP can be performed in data warehouses that undergo frequent updates and that do not. Following are some of the examples to show how OLAP solves complex queries involving facts to be measured across company’s best-interested dimensions. What is the amount spent (fact) for a particular produ...
数据仓库(Datawarehouse)是什么?OLTP以及OLAP的概念 数据仓库,英文名称为Data Warehouse,可简写为DW或DWH。数据仓库是一个支持管理决策的数据集合。数据是面向主题的、集成的、不易丢失的并且是时变的。数据仓库是所有操作环境和外部数据源的快照集合。它并不需要非常精确,因为它必须在特定的时间基础上从操作环境中提取...
数据仓库(Datawarehouse)是什么?OLTP以及OLAP的概念数据仓库,英文名称为Data Warehouse,可简写为DW或DWH。数据仓库是一个支持管理决策的数据集合。数据是面向主题的、集成的、不易丢失的并且是时变的。数据仓库是所有操作环境和外部数据源的快照集合。它并不需要非常精确,因为它必须在特定的时间基础上从操作环境中提取...
Huge volumes of data are stored in a spatial data warehouse. Stored data is explored and analyzed by different users. The users interrogate spatial data cube through Spatial OLAP queries which are generally misspoke, leading to non-pertinent results. Therefore, we propose in this paper a Spatial...
Cloud OLAP in Data Warehouses allows calculation of analytical business information using metrics for modeling, planning and forecasting.
As a result, DW queries are executed over real time data or very close to that. Moreover, real time loadings do not impact queries response time. In addition, we extended the Star Schema Benchmark to address loading operational data in real time. The extended benchmark was used to ...
第十章 数据仓库技术与联机分析处理 Data Warehouse OLAP 数据库处理的两大应用 联机事务处理(OLTP) 决策支持系统(DSS) 数据库处理的两大应用 联机事务处理(OLTP) 操作型处理,为企业的特定应用服务 是对数据库的联机的日常操作,通常是对一个或一组记录的查询和修改 人们关心的是响应时间、数据的安全性和完整性 ...