AWS Data Analytics Quiz - DynamoDB

Created on July 18, 2020 By

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AWS Certification

AWS Data Analytics – Quiz 2: DynamoDB

a) Incorrect. TTL does not use up WCU/RCU so would not cause the exception
b) Correct. This table has been poorly partitioned and there is a good chance of a ‘hot partition’ due to high demand for a particular game in a specific country. User_ID would have provided much higher cardinality and a better key, with less chance of exceptions.
c) Incorrect. In fact DynamoDB Acceleration (caching) may help mitigate the risk of exceptions, and will definitely not contribute to this particular exception.
d) Correct. Scans can consume a lot of RCU

1 / 10

QUESTION

An MMO game leaderboard is being stored in DynamoDB. Which of the following could cause ‘ProvisionedThroughputException’ from DynamoDB?

(Select Two)

a) Expired leaderboard data being automatically removed via TTL

b) A primary key constructed of Country (Hash) and Game_ID (Range)

c) Using Dynamo DAX

d) Frequent Scan API calls

2 / 10

QUESTION

A DynamoDB table needs to hold 100GB data and support 9000 RCU, 9000 WCU

How many partitions will it have?

12

10

9

8

3 / 10

QUESTION

Which of the following are true for Local & Global Indexes in DynamoDB?

a) LSI can only be set at table creation time

b) GSI can only be set at table creation time

c) LSI creates a new DynamoDB table

d) You must define RCU/WCU for GSI

4 / 10

QUESTION

Which of the following is true for DynamoDB?

a) Max Item (row) size is 400KB

b) Max attribute size is 400KB

c) Max Item (row) size is 1MB

d) Max attribute size is 1MB

5 / 10

QUESTION

Which of the following are ways to trigger real-time actions from DynamoDB?

(Select Two)

a) DynamoDB eventAgent

b) DynamoDB Streams + AWS Lambda

c) DynamoDB Streams + Kinesis Adapter

d) DynamoDB Streams + Kinesis Firehose

6 / 10

QUESTION

What is the most efficient way to delete expired data from DynamoDB Tables?

a) Use DynamoDB Streams & Lamda Triggers

b) Simply set a TTL for each item in the table

c) Create a expired attribute, populate with expiry epoch and set TTL for each item in the table via the new attribute

d) Use DynamoDB auto-tiering to automatically move (or delete) data

7 / 10

QUESTION

An small online retailer is using DynamoDB to support its e-commerce shopping carts.

Based on peak shopping traffic, they are expecting 10,000 objects per second of 5KB write and 40,000 objects per second of 3KB read. Strongly consistent reads are required.

What should the corresponding e-commerce cart table be configured with?

a) WCU = 80,000, RCU = 160,000

b) WCU = 80,000, RCU = 120,000

c) WCU = 50,000, RCU = 120,000

d) WCU = 50,000 RCU = 160,000

8 / 10

QUESTION

Which of the following are is a valid way of using DynamoDB with large objects?

a) Store the file in S3 and reference the S3 key in a DynamoDB attribute

b) Split the file into multiple objects of 400KB, using DynamoDB multipartID

c) Under no circumstance use DynamoDB with files larger than 400KB

d) Store the file in S3, adding DynamoDB tag

9 / 10

QUESTION

Which of the following is not a DynamoDB API call?

a) BatchGetItem

b) Query

c) UpdateTimeToLive

d) SetForeignKey

10 / 10

QUESTION

In DynamoDB tables, which of the following cannot be defined or updated after table creation?

(Select Two)

RCU, WCU

LSI

GSI

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AWS Data Analytics Quiz – DynamoDB

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