Serverless Programming Cookbook

Scenario 1

Your application needs to perform 5 million writes and 5 million eventually consistent reads per day with item sizes of 1 KB:

Number of writes per day = 5,000,000Number of writes per second = ceil (5,000,000 / (24 * 60 * 60))  = 581 WCU is required for each 1 KB of write. So writes required for each item = ceil(1) = 1Total WCU required  = 58 x 1 = 1.Similarly 5,000,000 eventually consistent reads per day  = 58 eventually consistent reads per second.1 RCU is required for 2 eventually consistency reads. So RCU required for 58 eventually consistent reads  = 291 RCU is required for 4KB of read. So reads required for each data item = ceil(1/4) = 1Total RCU required = 29 x 1 = 29.

This example is based on the pricing example given by Amazon. ...