DynamoDB Cost Estimation for High Throughput Workloads

After reviewing the latest AWS pricing information, here is the updated cost estimation for your specified DynamoDB workload:

📊 Workload Summary

• Write Throughput: 100,000 writes per second, each 0.5 KB in size.
• Read Throughput: 1,000,000 reads per second, each 0.5 KB in size, using eventually consistent reads.
• No Batching: Each operation is a single request.

💰 Provisioned Capacity Mode

In provisioned mode, you pay for the capacity units you provision, regardless of actual usage.docs.aws.amazon.com

Capacity Units Required

• Write Capacity Units (WCUs): Each write of up to 1 KB requires 1 WCU.

• 100,000 writes/sec × 1 WCU = 100,000 WCUs

• Read Capacity Units (RCUs): Each eventually consistent read of up to 4 KB requires 0.5 RCU.

• 1,000,000 reads/sec × 0.5 RCU = 500,000 RCUs

Pricing

Based on the standard table class in the US East (N. Virginia) region:aws.amazon.com

• WCU: $0.00065 per WCU-hour
• RCU: $0.00013 per RCU-houraws.amazon.com

Cost Calculation

• Hourly Cost:

• Writes: 100,000 WCUs × $0.00065 = **$n65.00/hour**

• Reads: 500,000 RCUs × $0.00013 = **$n65.00/hour**

• Total: $65.00 +$n65.00 = $130.00/hour

• Monthly Cost (assuming 730 hours/month):

• $130.00/hour × 730 hours = **$n94,900.00/month**

⚡ On-Demand Capacity Mode

In on-demand mode, you pay per request.docs.aws.amazon.com

Pricing

As of November 1, 2024, AWS reduced on-demand pricing by 50%:aws.amazon.com

• Write Request Units (WRUs): $0.625 per million writes
• Read Request Units (RRUs): $0.125 per million readsaws.amazon.com

Request Volume

• Daily Writes: 100,000 writes/sec × 86,400 seconds/day = 8.64 billion writes/day
• Daily Reads: 1,000,000 reads/sec × 86,400 seconds/day = 86.4 billion reads/day

Cost Calculation

• Daily Cost:

• Writes: 8.64 billion × $0.625/million = **$n5,400.00/day**

• Reads: 86.4 billion × $0.125/million = **$n10,800.00/day**

• Total: $5,400.00 +$n10,800.00 = $16,200.00/day

• Monthly Cost (30 days):

• $16,200.00/day × 30 days = **$n486,000.00/month**

📉 Cost Comparison

Provisioned capacity mode offers significant savings for predictable, high-throughput workloads.aws.amazon.com

💡 Additional Considerations

• Auto Scaling: Implementing auto scaling in provisioned mode can adjust capacity based on actual usage, potentially reducing costs further.
• Reserved Capacity: Committing to a one- or three-year term can provide additional discounts on provisioned capacity.
• Table Class: For infrequently accessed data, consider the DynamoDB Standard-IA table class, which offers lower storage costs.aws.amazon.comaws.amazon.comaws.amazon.com

For a more tailored cost estimate, you can use the calculator.aws.amazon.com.Sources