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Free AWS-Certified-Big-Data-Specialty Exam Braindumps (page: 4)

Page 3 of 124
PDF with 492 Questions

Which of the following statements is correct of Amazon DynamoDB?

  1. Data in DynamoDB cannot be shifted to Amazon Redshift. Instead, data can be shifted to Amazon
    CloudWatch.
  2. Every item in a DynamoDB table is identified by a foreign key, which allows you to quickly access data items.
  3. DynamoDB does not support multiple native data types (numbers, strings, binaries, and multi- valued attributes).
  4. DynamoDB does not have a fixed schema. Instead, each data item may have a different number of attributes.

Answer(s): D

Explanation:

DynamoDB does not have a fixed schema. Instead, each data item may have a different number of attributes. Multiple data types (strings, numbers, binary, and sets) add richness to the data model.


Reference:

http://awsdocs.s3.amazonaws.com/dynamodb/latest/dynamodb-dg.pdf



What kind of service is provided by AWS DynamoDB?

  1. Relational Database
  2. Document Database
  3. Dynamic Database
  4. NoSQL Database

Answer(s): D

Explanation:

DynamoDB is a fast, fully managed NoSQL database service.


Reference:

http://aws.amazon.com/dynamodb/



True or false: For an online game, it is better to use DynamoDB than a relational database engine.

  1. This is true because DynamoDB fully manages your database and can grow with your application requirements.
  2. This is false.
  3. This is true because DynamoDB has all the functionalities of a relational database.
  4. This is false because a relational database engine on Redshift has more functionalities than DynamoDB

Answer(s): A

Explanation:

This is true. An online game might start out with only a few thousand users and a light database workload consisting of 10 writes per second and 50 reads per second. However, if the game becomes successful, it may rapidly grow to millions of users and generate tens (or even hundreds) of thousands of writes and reads per second. It may also create terabytes or more of data per day.
Developing your applications against Amazon DynamoDB enables you to start small and simply dialup your request capacity for a table as your requirements scales, without incurring downtime.
Amazon DynamoDB gives you the peace of mind that your database is fully managed and can grow with your application requirements.


Reference:

http://aws.amazon.com/dynamodb/faqs/



In regard to DynamoDB, for which one of the following parameters does Amazon not charge you?

  1. I/O usage within the same Region
  2. Cost per provisioned write units
  3. Storage cost
  4. Cost per provisioned read units

Answer(s): A

Explanation:

In DynamoDB, you will be charged for the storage and the throughput you use rather than for the I/O which has been used.


Reference:

http://aws.amazon.com/dynamodb/pricing/






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