Review

To check your knowledge from this chapter, here are five questions that you should now be able to answer. Remember the exam techniques from Chapter 1, AWS Certified Database – Specialty Exam Overview, and remove the clearly incorrect answers first to help you:

1. You are working as a developer for a small company with a DynamoDB table. The company is complaining of poor performance after increasing the number of records in the table and they say they are seeing "throttling errors." What is the most cost-efficient option for them to consider?
   1. Enable TTL against a timestamp attribute.
   2. Implement DAX.
   3. Turn on Dynamo Streams.
   4. Turn on autoscaling.
2. You are designing a new DynamoDB table and need to calculate how many Capacity Units (CUs) to provision. Each item is 3 KB in size and you expect to read a maximum of 100 items and write 10 per second. You will only be using eventually consistent reads and standard writes.
   1. 50 RCUs and 30 WCUs
   2. 100 RCUs and 10 WCUs
   3. 50 RCUs...