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An unexpected cost for DynamoDB

0

Hello, I'm running a test on DynamoDB now. I used provisioned mode with 5 WCU and 5 RCU, no auto scale. However, the bill showed that I should pay for "$0.00013 per hour for units of read capacity beyond the free tier" and "$0.00065 per hour for units of write capacity beyond the free tier", which was actually 594 ReadCapacityUnit-Hrs and 594 WriteCapacityUnit-Hrs. Why there is an additional cost? I thought that I was using the free usage and the max usage was 5 WCU and 5 RCU, if I ran over this amount, it will show an error of "ProvisionedThroughputExceededException". Am I misunderstanding? Thanks!

Topics
DatabaseCloud Financial ManagementAWS Free Tier
Tags
Amazon DynamoDBAWS BillingAWS Free Tier
Language
English
Wilma
asked 7 months ago235 views
1 Answer
1

You are somewhat correct. You are free to use 25 WCU and 25 RCU per region under free tier, thats for all of your tables/indexes within a region. So you can add a maximum of 5 WCU and 5 RCU to 5 tables or indexes, any more and you will be charged.

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If you believe you were under this threshold, reach out to Customer Services and use Billing Support.

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EXPERT
Leeroy Hannigan
answered 7 months ago
  • Wilma
    7 months ago

    Thanks for your answer! Could I ask another question? What is the meaning of 594 ReadCapacityUnit-Hrs and 594 WriteCapacityUnit-Hrs? I believe that 1 RCU means that I can read 1 item per second. Does 594 ReadCapacityUnit-Hrs mean I can read 594 items per hour? But this seems weird because I can only read less than 1 item per second (594/60/60 < 1). The last question is that the cost for 594 ReadCapacityUnit-Hrs is 0.00013594 = 0.08. Why isn't 0.0001359424days I used. Again, Thanks a lot for your previous answer!

  • Leeroy Hannigan EXPERT
    7 months ago

    No, capacity is charged per hour. If you had 1 WCU and 1 RCU on a single table for a month, you would be charged approx. 730 ReadCapacityUnit-Hrs and 730 WriteCapacityUnit-Hrs as there is 730 hours in a month.

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