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Amazon Web Services Updated DAS-C01 Exam Questions and Answers by imran

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Amazon Web Services DAS-C01 Exam Overview :

Exam Name: AWS Certified Data Analytics - Specialty
Exam Code: DAS-C01 Dumps
Vendor: Amazon Web Services Certification: AWS Certified Data Analytics
Questions: 207 Q&A's Shared By: imran
Question 36

A company uses Amazon EC2 instances to receive files from external vendors throughout each day. At the end of each day, the EC2 instances combine the files into a single file, perform gzip compression, and upload the single file to an Amazon S3 bucket. The total size of all the files is approximately 100 GB each day.

When the files are uploaded to Amazon S3, an AWS Batch job runs a COPY command to load the files into an Amazon Redshift cluster.

Which solution will MOST accelerate the COPY process?

Options:

A.

Upload the individual files to Amazon S3. Run the COPY command as soon as the files become available.

B.

Split the files so that the number of files is equal to a multiple of the number of slices in the Redshift cluster. Compress and upload the files to Amazon S3. Run the COPY command on the files.

C.

Split the files so that each file uses 50% of the free storage on each compute node in the Redshift cluster. Compress and upload the files to Amazon S3. Run the COPY command on the files.

D.

pply sharding by breaking up the files so that the DISTKEY columns with the same values go to the same file. Compress and upload the sharded files to Amazon S3. Run the COPY command on the files.

Discussion
Question 37

A company uses an Amazon EMR cluster with 50 nodes to process operational data and make the data available for data analysts These jobs run nightly use Apache Hive with the Apache Jez framework as a processing model and write results to Hadoop Distributed File System (HDFS) In the last few weeks, jobs are failing and are producing the following error message

"File could only be replicated to 0 nodes instead of 1"

A data analytics specialist checks the DataNode logs the NameNode logs and network connectivity for potential issues that could have prevented HDFS from replicating data The data analytics specialist rules out these factors as causes for the issue

Which solution will prevent the jobs from failing'?

Options:

A.

Monitor the HDFSUtilization metric. If the value crosses a user-defined threshold add task nodes to the EMR cluster

B.

Monitor the HDFSUtilization metri.c If the value crosses a user-defined threshold add core nodes to the EMR cluster

C.

Monitor the MemoryAllocatedMB metric. If the value crosses a user-defined threshold, add task nodes to the EMR cluster

D.

Monitor the MemoryAllocatedMB metric. If the value crosses a user-defined threshold, add core nodes to the EMR cluster.

Discussion
Question 38

A financial company uses Amazon Athena to query data from an Amazon S3 data lake. Files are stored in the S3 data lake in Apache ORC format. Data analysts recently introduced nested fields in the data lake ORC files, and noticed that queries are taking longer to run in Athena. A data analysts discovered that more data than what is required is being scanned for the queries.

What is the MOST operationally efficient solution to improve query performance?

Options:

A.

Flatten nested data and create separate files for each nested dataset.

B.

Use the Athena query engine V2 and push the query filter to the source ORC file.

C.

Use Apache Parquet format instead of ORC format.

D.

Recreate the data partition strategy and further narrow down the data filter criteria.

Discussion
Question 39

An Amazon Redshift database contains sensitive user data. Logging is necessary to meet compliance requirements. The logs must contain database authentication attempts, connections, and disconnections. The logs must also contain each query run against the database and record which database user ran each query.

Which steps will create the required logs?

Options:

A.

Enable Amazon Redshift Enhanced VPC Routing. Enable VPC Flow Logs to monitor traffic.

B.

Allow access to the Amazon Redshift database using AWS IAM only. Log access using AWS CloudTrail.

C.

Enable audit logging for Amazon Redshift using the AWS Management Console or the AWS CLI.

D.

Enable and download audit reports from AWS Artifact.

Discussion
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