Best practices for designing and using partition keys effectively
The primary key that uniquely identifies each item in an Amazon DynamoDB table can be simple (a partition key only) or composite (a partition key combined with a sort key).
Generally speaking, you should design your application for uniform activity across all logical partition keys in the table and its secondary indexes. You can determine the access patterns that your application requires, and read and write units that each table and secondary index requires.
By default, every partition in the table will strive to deliver the full capacity of 3,000 RCU and 1,000 WCU. The total throughput across all partitions in the table may be constrained by the provisioned throughput in provisioned mode, or by the table level throughput limit in on-demand mode. See Service Quotas for more information.
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