与Oracle和SQL Server等其他关系数据库管理系统一样，Informix也有内部优化器，负责选择最佳的查询执行计划。

Like other relational database management systems such as Oracle and SQL Server, Informix has its internal optimizer, which is responsible for selecting the best query execution plan.

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要为ClearQuest测试管理创建一个备份服务器，我们在这台机器上选择了一个IBM AIX系统和一个用户ID来创建两个数据库。

To create a backend server for ClearQuest test management, we selected an IBM AIX system and a user ID on the machine to create two databases.

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第三章论述篮球综合测试系统的整体设计方案，从数据库系统结构的选择、服务器端数据库管理系统的选择和客户端开发工具选择方面进行阐述。

The third chapter discusses the overall scheme of the system, including three pacts, the choice of the database structure, the database management system and the development tools in the client.

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