August 2022
Beginner to intermediate
463 pages
9h 22m
Chinese
Content preview from Tableau Prep即学即用
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216
｜
第
24
章
图
24
-
1
：在输入步骤的 meta data（元数据）窗格中取消选择某些字段
在这里对数据集进行修改，可以节省时间，并减少以后数据准备过程中出现的复杂
情况。
24.2
性能慢、生成慢、输出慢
正如前面已经提到的，性能是一个重要的因素，所以只要有机会就可以考虑删除不
必要的数据。这样做不仅仅有助于更高的处理速度，而且能让软件适应你想要的工
作方式，展示出下一步可能想要做的事情，然后让你能够做出这些改变。没有什么
比观看屏幕上的进度加载过程所浪费的时间更令人沮丧了。
减少行和列的数量可以帮助改善性能，并减少
Prep Builder
必须处理的数据量。在
数据较少的情况下，清理、重塑和合并过程的效率更高，因为一旦需要评估的数据
行数较少，就更容易发现所需的数据内容，更不用说一旦做出这些更改，处理这些
数据的速度会更快。还可以通过在输入步骤以及整个流程中许多其他的步骤中应用
过滤器来减少数据的行数。可以通过在输入步骤中取消选择列，或在整个流程的任
何步骤中排除列来减少数据列的数量。
｜
217
在输入过程中删除数据
不仅输入处理和生成时间受到不必要数据的影响，输出处理时间同样也会受到影响。
可以通过
Tableau Prep Builder
或基于服务器的
Prep Conductor
工具非常频繁地运行
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.