Key – value based database (DynamoDB)

Which of the following is/are a key-value data store?试题 14选择一项或多项：a.CouchDBb.Hbasec.Voldemortd.Hypertablee.Dynamof.MongoDB

Dynamo is a NoSQL database developed by Amazon. Which of the following about Dynamo is/are correct?试题 8选择一项或多项：a.Dynamo is targeted mainly at applications where no updates are rejected due to concurrent writes.b.Dynamo uses the technique of consistent hashing to map each node to a single datacenter.c.Dynamo is designed to achieve strong consistency and high data availability simultaneously.d.Dynamo provides security related support for managing data, such as authentication and authorization.

Does Dynamo DB sacrifice Consistency for Scalability and Latency?If yes, which design element or service level agreement specifies this? If no, how this couldbe achieved?

Which of the following entities should be used for an Amazon Elastic Compute Cloud (Amazon EC2) Instance to access a DynamoDB table?Question 30Answera.AWS Key Management Service (KMS)b.IAM rolec.Amazon Cognitod.AWS IAM user access keys

Question 3True or False: Amazon Relational Database Service (Amazon RDS) is more suitable for databases that handle structured or relational data, where users can count with features like auto-increment and table joins. Amazon DynamoDB is more suitable for NoSQL database workloads, where tables are collection of items that have their own attributes.1 pointTrueFalse