In this chapter, we learned about Amazon DynamoDB, NoSQL database. DynamoDB frees the user from handling the burden of managing the infrastructure, scaling the database, administrative tasks, and so on. DynamoDB automatically replicates our data on multiple availability zones so that the data is highly available. We saw different ways, such as AWS Management Console, AWS CLI, and AWS SDK - Java, to create DynamoDB tables and we also performed CRUD operations using the AWS SDK - Java. While retrieving the data from tables, it is important to choose between the query and scan operations. Scan operations are slow when you are scanning and filtering items on large tables. So to avoid such a situation where provisioned read throughput is utilized by a scan operation, create a table or secondary indexes where you can use the query operation. In the next chapter, we will see how we can use Amazon ElastiCache. ElastiCache supports Redis and Memcached caching servers. We will create the ElastiCache...