在Data Studio 3.1.1中使用Query Tuner进行查询优化
IBM Data Studio 3.1.1 产品包中包含了 SQL 性能调优工具，并与数据库开发和管理工具无缝结合。Data Studio 3.1.1 用户可以在编辑 SQL 语句、编辑 Routine、编写 java JDBC 代码等多种场合调用 SQL 性能调优工具进行查询优化。
本文将分别就如何在 Data Studio 3.1.1 的上述应用场景中使用集成的 SQL 性能调优工具进行详细介绍。
IBM Data Studio 3.1.1 产品包中包含了 SQL 性能调优工具，并与开发和管理工具无缝结合。Data Studio 3.1.1 用户可以在编辑 SQL 语句、编辑 Routine、编写 java JDBC 代码等多种场合调用 SQL 性能调优工具进行查询优化。本文将分别就如何在 Data Studio 3.1.1 的上述应用场景中使用集成的 SQL 性能调优工具进行详细介绍。本文会介绍 Data Studio 3.1.1 的高级特性，因此读者阅读之前需要对 Data Studio 3.1.1 的基本功能有所了解。
Data Studio 概述
Data Studio 是 IBM 开发的一个免费的综合数据库开发管理工具平台，IBM 数据生命周期管理工具和解决方案家族的一部分。用户可以用它来设计和开发数据库应用程序，对数据库应用程序的数据操作进行优化，以及监视数据库的健康状况。它可以安装在 Red Hat® Linux、SUSE Linux、Windows 和 AIX（仅限于 Data Studio Web 控制台组件）操作系统上。
Data Studio 主要面向一下三种应用场景提供服务：
- 数据库管理场景。Data Studio 3.1.1 提供了强大的数据库对象管理功能，可以代替 DB2 Control Center 作为管理数据库对象的工具。
- 数据库应用开发场景。Data Studio 3.1.1 提供了强大的数据库应用程序开发工具，支持 Java™、SQL PL 和 PL/SQL 例程、XML 编辑器及其他开发方式。并且可以和 IBM 的查询优化工具整合，对查询性能进行优化。
- 数据库健康状况和可用性的监控和管理计划作业的场景。Data Studio 3.1.1 提供了基于 Web 的健康状况和可用性的监控工具，能够对数据库健康状况进行监控并生成告警，同时也提供管理计划作业的工具。
Data Studio 3.1.1 将 Optim Development Studio、Optim Database Administrator 和以前版本的 IBM Data Studio 的功能整合到单一产品中，并整合了部分 Optim Query Workload Tuner 的功能。这样，Data Studio 为数据库管理和应用开发提供了更高的可用性。
图 1.IBM Data Studio 3.1.1
Query Tuner 简介
Data Studio 3.1.1 中集成的 Ouery Tuner 组件是 Infosphere Optim Query Workload Tuner 功能的一部分。Infosphere Optim Query Workload Tuner 是使用单独许可证收费的产品，但集成在 Data Studio 中的部分是可以免费使用的。
在数据库的开发和应用当中，往往出现某些纷繁复杂的数据查询和访问环节存在设计上的缺陷，以至于严重影响了应用的效率，此时即使是有丰富经验的 DBA 也无从下手。不仅仅数据库管理员（DBA）能管理数据库对象，维护数据库应用，而且开发人员（developers）可以进行数据库查询和设计的优化，将最佳实践和顾问功能集成于一体。
集成了 Query Tuner 的 Data Studio 3.1.1 具备诸如以下性能优势：
- 在广为熟悉的 Eclipse 开发环境下操作，与 Data Studio 实现无缝集成
- 通过使开发人员在开发阶段调优 SQL 以降低开销和风险。
- 鼓励开发人员（developers）与数据库管理员（DBAs）之间的协作。DBA 可以更好的了解数据库是被哪些 SQL 访问的，便于执行优化策略，Developer 也可以了解更多的数据库优化知识。
安装 IBM Data Studio 3.1.1 中集成的 Query Tuner 组件
IBM Data Studio 3.1.1 产品包中包含了 SQL 性能调优工具，用户只需要在安装 IBM Data Studio 3.1.1 过程的 Select the features to install（选择需要安装的特性）这一步中，勾选 Query Tuning（查询优化）这一项。
图 2. 在安装过程中勾选 Query Tuning（查询优化）
安装完成之后，就可以在 Data Studio 3.1.1 中使用查询优化功能。
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