Use an enterprise schema-based user database to create Enhancement Requests and log defects against the system.

使用一个基于企业级图表的用户数据库来创建Enhancement Requests，并且对系统的缺陷加以记录。

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Optimization of relational schema is very important and difficult to design a database system, the ultimate goal of optimization is to construct a good relational schema for database system.

关系模式优化是关系数据库系统设计中的一个重点和难点，优化的最终目的是建立一个良好的关系模式。

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In contrast, an OLAP system often spans multiple versions of a database schema, due to the evolutionary process of an organization.

相比之下，由于组织的变化，OLAP系统常常跨越数据库模式的多个版本。

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