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在完成第四章 数据连接后即可开始创建数据集。
数据集是在数据源基础上创建的，相比于数据源的多样性，数据集有自己的定义和规则，提供了统一的数据操作接口。对分散、异构数据源中的数据进行一定的整合处理，形成一个可以用于数据分析和展示的模型。
缓存数据集和直连数据集都可以用来创建仪表板或报表，但一般情况下更推荐您使用缓存数据集来创建仪表板，使用直连数据集创建报表。
主要原因如下：
缓存数据集基于缓存，将按照定义运算得出的数据存于缓存中，这样更利于顺滑展示大屏炫酷效果，快速完成人机交互。
直连数据集仅包含对相关运算过程的定义，实际的数据在浏览文档时获取，因此数据是实时刷新的，更利于创建报表。
下图为创建数据集的流程，本章将按此顺序为您详细讲述如何创建出符合实际需要的数据集。图中虚线框部分为可选步骤，请您根据实际情况选用。
type=info
提示
创建缓存数据集和直连数据集的过程基本一致，文中将不再分开介绍。