We already mentioned that DynamoDB is a distributed cluster that stores our data in a redundant and distributed manner. The data is stored in partitions, which are distributed and replicated across availability zones for fault tolerance, high availability, and redundancy. The partitions are fully managed by AWS, but we can determine the pattern of distribution of our data across partitions with the partition key.
DynamoDB will, in principle, always assign enough partitions to your table to handle the provisioned capacity for your tables. But it is on us to make sure the performance is always up to the capacity defined, since the data is stored in the partitions using the partition key. If our partition keys have a bad distribution, then we could create a so-called hot partition where a lot of items with the same partition key are stored.
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