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数据建模有哪些模型
2022-07-06 09:01:00 【棱镜7】
1. 星型模型
星型模型是最常用的维度建模方式。星型模型是以事实表为中心,所有维度表直接连接在事实表上。星型模型由一个事实表和一组维度表组成。
2. 雪花模型
雪花模式(Snowflake Schema)是对星形模式的扩展。雪花模式的维度表可以拥有其他维度表的,虽然这种模型相比星型更规范一些,但是由于这种模型不太容易理解,维护成本比较高,而且性能方面需要关联多层维表,性能比星型模型要低。
3. 星座模型
星座模式是星型模式延伸而来,星型模式是基于一张事实表的,而星座模式是基于多张事实表的,而且共享维度信息。在很多时候维度空间内的事实表不止一个,而一个维表也可能被多个事实表用到。在业务发展后期,绝大部分维度建模都采用的是星座模式。
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