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<br />Introduction<br />There has been a lot of buzz and hype -- some factual, some not so well-founded -- surrounding the opportunities presented by Service-oriented Architectures (SOA) and its implementation as Web services. Analysts have predicted, pund

Domain-Driven Design (DDD) is a collection of principles and patterns that help developers craft elegant object systems. Properly applied it can lead to software abstractions called domain models. These models encapsulate complex business logic, closing th

Context<br />You have an integration solution that consists of applications that are provided by different vendors. These applications run on a variety of platforms. Some of these applications generate messages and many other applications consume the messa

Introduction<br />I was horrified: My beautiful tiered architecture was buckling under the stress tests—at one tenth of the expected load of the system. And this was quality hardware, not the regular junk that we scrapped together in most test labs. After

数据仓库基础 首先，让我们了解一下基本的数据仓库定义。建立数据仓库是一个创建、维护和查询的过程。Ralph Kimball将数据仓库定义为“满足查询和分析的事务处理数据的拷贝的特定结构”。创建数据仓库的过程包括数据仓库的逻辑模型和物理数据库。维护的过程包括ETL过程，即将数据从OLTP系统中抽取到数据仓库。查询的过程是从数据仓库中收集信息。简单来说，数据仓库是一个从数据中获取信息的结构。 其次，我们需要区分信息和数据之间的差别。数据仅仅是简单的事实描述，分散的数据不存在有意义的信息。举例

<br />社会的需求和计算机技术的不断发展，人们开始尝试对原来数据库中的数据进行再加工，形成一个综合的、面向分析的环境，以支持科学决策的产生。由此，数据仓库的思想、技术、产品逐渐开始形成。对于什么是数据仓库，许多人提出了不同的看法。数据仓库概念的创始人W.H.Inmon在《Building the Data WareHouse》一书中指出："数据仓库是面向主题的、集成的、稳定的、随时间变化的数据集合，用以支持经营管理中的决策制定过程。"<br /><br />在《Building Data Warehou