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Free DBS-C01 Exam Braindumps (page: 37)

Page 37 of 82
PDF with 327 Questions

A ride-hailing application uses an Amazon RDS for MySQL DB instance as persistent storage for bookings. This application is very popular and the company expects a tenfold increase in the user base in next few months. The application experiences more traffic during the morning and evening hours.

This application has two parts:

-An in-house booking component that accepts online bookings that directly correspond to simultaneous requests from users.
-A third-party customer relationship management (CRM) component used by customer care representatives. The CRM uses queries to access booking data.

A database specialist needs to design a cost-effective database solution to handle this workload.
Which solution meets these requirements?

  1. Use Amazon ElastiCache for Redis to accept the bookings. Associate an AWS Lambda function to capture changes and push the booking data to the RDS for MySQL DB instance used by the CRM.
  2. Use Amazon DynamoDB to accept the bookings. Enable DynamoDB Streams and associate an AWS Lambda function to capture changes and push the booking data to an Amazon SQS queue. This triggers another Lambda function that pulls data from Amazon SQS and writes it to the RDS for MySQL DB instance used by the CRM.
  3. Use Amazon ElastiCache for Redis to accept the bookings. Associate an AWS Lambda function to capture changes and push the booking data to an Amazon Redshift database used by the CRM.
  4. Use Amazon DynamoDB to accept the bookings. Enable DynamoDB Streams and associate an AWS Lambda function to capture changes and push the booking data to Amazon Athena, which is used by the CRM.

Answer(s): B



An online advertising website uses an Amazon DynamoDB table with on-demand capacity mode as its data store. The website also has a DynamoDB Accelerator (DAX) cluster in the same VPC as its web application server. The application needs to perform infrequent writes and many strongly consistent reads from the data store by querying the DAX cluster.
During a performance audit, a systems administrator notices that the application can look up items by using the DAX cluster. However, the QueryCacheHits metric for the DAX cluster consistently shows 0 while the QueryCacheMisses metric continuously keeps growing in Amazon CloudWatch.
What is the MOST likely reason for this occurrence?

  1. A VPC endpoint was not added to access DynamoDB.
  2. Strongly consistent reads are always passed through DAX to DynamoD
  3. DynamoDB is scaling due to a burst in traffic, resulting in degraded performance.
  4. A VPC endpoint was not added to access CloudWatch.

Answer(s): B


Reference:

https://github.com/aws/aws-sdk-java/issues/1983



A financial company recently launched a portfolio management solution. The backend of the application is powered by Amazon Aurora with MySQL compatibility. The company requires an RTO of 5 minutes and an RPO of 5 minutes. A database specialist must configure an efficient disaster recovery solution with minimal replication lag.
Which approach should the database specialist take to meet these requirements?

  1. Configure AWS Database Migration Service (AWS DMS) and create a replica in a different AWS Region.
  2. Configure an Amazon Aurora global database and add a different AWS Region.
  3. Configure a binlog and create a replica in a different AWS Region.
  4. Configure a cross-Region read replica.

Answer(s): B



A company hosts an internal file-sharing application running on Amazon EC2 instances in VPC_A.
Thisapplication is backed by an Amazon ElastiCache cluster, which is in VPC_B and peered with VPC_A.
Thecompany migrates its application instances from VPC_A to VPC_B. Logs indicate that the file-sharing application no longer can connect to the ElastiCache cluster.
What should a database specialist do to resolve this issue?

  1. Create a second security group on the EC2 instances. Add an outbound rule to allow traffic from the ElastiCache cluster security group.
  2. Delete the ElastiCache security group. Add an interface VPC endpoint to enable the EC2 instances to connect to the ElastiCache cluster.
  3. Modify the ElastiCache security group by adding outbound rules that allow traffic to VPC_B’s CIDR blocks from the ElastiCache cluster.
  4. Modify the ElastiCache security group by adding an inbound rule that allows traffic from the EC2 instances security group to the ElastiCache cluster.

Answer(s): D



Page 37 of 82



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