DynamoDB分区表如何？ [英] How does DynamoDB partition tables?
问题描述
下面我概括了可以将自己的值插入其中的方程。
按容量划分的分区 =（ RCU / 3000）+（ WCU / 1000）
按大小划分分区 = TableSizeInGB / 10
总分区 =取最大的分区容量和分区大小。将其四舍五入为整数。
总而言之，一个分区最多可以包含3000个RCU，1000个WCU和10GB的数据。创建分区后，RCU，WCU和数据均匀地分布在它们之间。
请注意，据我所知，一旦创建了分区，就会降低RCU， WCU和删除数据不会导致删除分区。我目前对此没有参考。
The DynamoDB documentation describes how table partitioning works in principle, but its very light on specifics (i.e. numbers). Exactly how, and when, does DynamoDB table partitioning take place?
I found this presentation produced by Rick Houlihan (Principal Solutions Architect DynamoDB) from AWS Loft San Franciso on 20th January 2016.
The presention is also on Youtube.
This slide provides the important detail on how/when table partitioning occurs:
And below I have generalised the equation you can plug your own values into.
Partitions by capacity = (RCUs/3000) + (WCUs/1000)
Partitions by size = TableSizeInGB/10
Total Partitions = Take the largest of your Partitions by capacity and Partitions by size. Round this up to an integer.
In summary a partition can contain a maximum of 3000 RCUs, 1000 WCUs and 10GB of data. Once partitions are created, RCUs, WCUs and data are spread evenly across them.
Note that, to the best of my knowledge, once you have created partitions, lowering RCUs, WCUs and removing data will not result in the removal of partitions. I don't currently have a reference for this.
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