If an application writes 600 items of 5 KB each every minute, what should the write throughput be set to?

To determine the required write throughput, first calculate the total amount of data being written in a minute. If an application writes 600 items of 5 KB each, the total write size per minute can be calculated by multiplying the number of items by the size of each item.

600 items multiplied by 5 KB per item equals 3000 KB per minute, which can also be expressed as 3 MB per minute. In Amazon DynamoDB, throughput is measured in write capacity units (WCUs), where one WCU allows for writing one item up to 1 KB in size per second.

To convert the total write size into WCUs:

1. Determine how many KB are being written per second. Since there are 60 seconds in a minute, divide the total KB for the minute by 60 seconds.

   • 3000 KB per minute / 60 seconds = 50 KB per second.

2. Now, to find how many write capacity units are needed, divide the total KB per second by the size of an item (1 KB):

   • 50 KB per second / 1 KB per WCU = 50 WCUs.

Therefore, the appropriate setting for write throughput is 50 provisioned write capacity units