Read throughput in DynamoDB - Stack Overflow
https://stackoverflow.com/questions/28199925/read-throughput-in-dynamodb
Jan 27, 2015 · With these operations, DynamoDB uses the cumulative size of the processed items to calculate provisioned throughput. For example, if a Query operation retrieves 100 items that are 1 KB each, the read capacity calculation is not (100 × 4 KB) = 100 read capacity units, as if those items were retrieved individually using GetItem or BatchGetItem.
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