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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。
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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。