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DAS-C01 - AWS Certified Data Analytics - Specialty

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DAS-C01 Questions and Answers

Question # 1

A large ride-sharing company has thousands of drivers globally serving millions of unique customers every day. The company has decided to migrate an existing data mart to Amazon Redshift. The existing schema includes the following tables.

A trips fact table for information on completed rides. A drivers dimension table for driver profiles.

A customers fact table holding customer profile information.

The company analyzes trip details by date and destination to examine profitability by region. The drivers data rarely changes. The customers data frequently changes.

What table design provides optimal query performance?

A.

Use DISTSTYLE KEY (destination) for the trips table and sort by date. Use DISTSTYLE ALL for the drivers and customers tables.

B.

Use DISTSTYLE EVEN for the trips table and sort by date. Use DISTSTYLE ALL for the drivers table. Use DISTSTYLE EVEN for the customers table.

C.

Use DISTSTYLE KEY (destination) for the trips table and sort by date. Use DISTSTYLE ALL for the drivers table. Use DISTSTYLE EVEN for the customers table.

D.

Use DISTSTYLE EVEN for the drivers table and sort by date. Use DISTSTYLE ALL for both fact tables.

Question # 2

A company has an application that uses the Amazon Kinesis Client Library (KCL) to read records from a Kinesis data stream.

After a successful marketing campaign, the application experienced a significant increase in usage. As a result, a data analyst had to split some shards in the data stream. When the shards were split, the application started throwing an ExpiredIteratorExceptions error sporadically.

What should the data analyst do to resolve this?

A.

Increase the number of threads that process the stream records.

B.

Increase the provisioned read capacity units assigned to the stream’s Amazon DynamoDB table.

C.

Increase the provisioned write capacity units assigned to the stream’s Amazon DynamoDB table.

D.

Decrease the provisioned write capacity units assigned to the stream’s Amazon DynamoDB table.

Question # 3

A data analytics specialist is setting up workload management in manual mode for an Amazon Redshift environment. The data analytics specialist isdefining query monitoring rules to manage system performance and user experience of an Amazon Redshift cluster.

Which elements must each query monitoring rule include?

A.

A unique rule name, a query runtime condition, and an AWS Lambda function to resubmit any failed queries in off hours

B.

A queue name, a unique rule name, and a predicate-based stop condition

C.

A unique rule name, one to three predicates, and an action

D.

A workload name, a unique rule name, and a query runtime-based condition

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