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为什么要数据分层
2022-07-06 09:01:00 【棱镜7】
- 用空间换时间，通过大量的预处理来提升应用系统的效率，因此数据仓库会存在大量的冗余数据。
- 通过数据分层管理可以简化数据清洗过程，相当于把一个复杂的工作拆成了多个简单的工作，当数据发生错误的时候，往往我们只需要局部调整某个步骤即可。
- 如果不分层的话，如果原业务系统发生变化会影响整个数据清洗过程，工作量巨大
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