Amazon DBS-C01 Question Answers

Question # 1

A company recently migrated its line-of-business (LOB) application to AWS. The application uses an Amazon RDS for SQL Server DB instance as its database engine. The company must set up cross-Region disaster recovery for the application. The company needs a solution with the lowest possible RPO and RTO. Which solution will meet these requirements?

A. Create a cross-Region read replica of the DB instance. Promote the read replica at the time of failover. 
B. Set up SQL replication from the DB instance to an Amazon EC2 instance in the disaster recovery Region. Promote the EC2 instance as the primary server. 
C. Use AWS Database Migration Service (AWS KMS) for ongoing replication of the DB instance in the disaster recovery Region. 
D. Take manual snapshots of the DB instance in the primary Region. Copy the snapshots to the disaster recovery Region. 

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Question # 2

A financial services company runs an on-premises MySQL database for a critical application. The company is dissatisfied with its current database disaster recovery (DR) solution. The application experiences a significant amount of downtime whenever the database fails over to its DR facility. The application also experiences slower response times when reports are processed on the same database. To minimize the downtime in DR situations, the company has decided to migrate the database to AWS. The company requires a solution that is highly available and the most cost-effective. Which solution meets these requirements?

A. Create an Amazon RDS for MySQL Multi-AZ DB instance and configure a read replica in a different Availability Zone. Configure the application to reference the replica instance endpoint and report queries to reference the primary DB instance endpoint. 
B. Create an Amazon RDS for MySQL Multi-AZ DB instance and configure a read replica in a different Availability Zone. Configure the application to reference the primary DB instance endpoint and report queries to reference the replica instance endpoint. 
C. Create an Amazon Aurora DB cluster and configure an Aurora Replica in a different Availability Zone. Configure the application to reference the cluster endpoint and report queries to reference the reader endpoint. 
D. Create an Amazon Aurora DB cluster and configure an Aurora Replica in a different Availability Zone. Configure the application to reference the primary DB instance endpoint and report queries to reference the replica instance endpoint. 

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Question # 3

A company has branch offices in the United States and Singapore. The company has a three-tier web application that uses a shared database. The database runs on an Amazon RDS for MySQL DB instance that is hosted in the us-west-2 Region. The application has a distributed front end that is deployed in us-west-2 and in the ap-southeast-1 Region. The company uses this front end as a dashboard that provides statistics to sales managers in each branch office. The dashboard loads more slowly in the Singapore branch office than in the United States branch office. The company needs a solution so that the dashboard loads consistently for users in each location. Which solution will meet these requirements in the MOST operationally efficient way?

A. Take a snapshot of the DB instance in us-west-2. Create a new DB instance in apsoutheast-2 from the snapshot. Reconfigure the ap-southeast-1 front-end dashboard to access the new DB instance. 
B. Create an RDS read replica in ap-southeast-1 from the primary DB instance in us-west2. Reconfigure the ap-southeast-1 front-end dashboard to access the read replica. 
C. Create a new DB instance in ap-southeast-1. Use AWS Database Migration Service (AWS DMS) and change data capture (CDC) to update the new DB instance in apsoutheast-1. Reconfigure the ap-southeast-1 front-end dashboard to access the new DB instance. 
D. Create an RDS read replica in us-west-2, where the primary DB instance resides. Create a read replica in ap-southeast-1 from the read replica in us-west-2. Reconfigure the ap-southeast-1 front-end dashboard to access the read replica in ap-southeast-1. 

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Question # 4

A software-as-a-service (SaaS) company is using an Amazon Aurora Serverless DB cluster for its production MySQL database. The DB cluster has general logs and slow query logs enabled. A database engineer must use the most operationally efficient solution with minimal resource utilization to retain the logs and facilitate interactive search and analysis. Which solution meets these requirements?

A. Use an AWS Lambda function to ship database logs to an Amazon S3 bucket. Use Amazon Athena and Amazon QuickSight to search and analyze the logs. 
B. Download the logs from the DB cluster and store them in Amazon S3 by using manual scripts. Use Amazon Athena and Amazon QuickSight to search and analyze the logs. 
C. Use an AWS Lambda function to ship database logs to an Amazon S3 bucket. Use Amazon Elasticsearch Service (Amazon ES) and Kibana to search and analyze the logs. 
D. Use Amazon CloudWatch Logs Insights to search and analyze the logs when the logs are automatically uploaded by the DB cluster. 

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Question # 5

A gaming company uses Amazon Aurora Serverless for one of its internal applications. The company's developers use Amazon RDS Data API to work with the Aurora Serverless DB cluster. After a recent security review, the company is mandating security enhancements. A database specialist must ensure that access to RDS Data API is private and never passes through the public internet. What should the database specialist do to meet this requirement?

A. Modify the Aurora Serverless cluster by selecting a VPC with private subnets. 
B. Modify the Aurora Serverless cluster by unchecking the publicly accessible option. 
C. Create an interface VPC endpoint that uses AWS PrivateLink for RDS Data API. 
D. Create a gateway VPC endpoint for RDS Data API. 

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Question # 6

A company runs a customer relationship management (CRM) system that is hosted onpremises with a MySQL database as the backend. A custom stored procedure is used to send email notifications to another system when data is inserted into a table. The company has noticed that the performance of the CRM system has decreased due to database reporting applications used by various teams. The company requires an AWS solution that would reduce maintenance, improve performance, and accommodate the email notification feature. Which AWS solution meets these requirements?

A. Use MySQL running on an Amazon EC2 instance with Auto Scaling to accommodate the reporting applications. Configure a stored procedure and an AWS Lambda function that uses Amazon SES to send email notifications to the other system. 
B. Use Amazon Aurora MySQL in a multi-master cluster to accommodate the reporting applications. Configure Amazon RDS event subscriptions to publish a message to an Amazon SNS topic and subscribe the other system's email address to the topic. 
C. Use MySQL running on an Amazon EC2 instance with a read replica to accommodate the reporting applications. Configure Amazon SES integration to send email notifications to the other system. 
D. Use Amazon Aurora MySQL with a read replica for the reporting applications. Configure a stored procedure and an AWS Lambda function to publish a message to an Amazon SNS topic. Subscribe the other system's email address to the topic. 

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Question # 7

A security team is conducting an audit for a financial company. The security team discovers that the database credentials of an Amazon RDS for MySQL DB instance are hardcoded in the source code. The source code is stored in a shared location for automatic deployment and is exposed to all users who can access the location. A database specialist must use encryption to ensure that the credentials are not visible in the source code. Which solution will meet these requirements?

A. Use an AWS Key Management Service (AWS KMS) key to encrypt the most recent database backup. Restore the backup as a new database to activate encryption. 
B. Store the source code to access the credentials in an AWS Systems Manager Parameter Store secure string parameter that is encrypted by AWS Key Management Service (AWS KMS). Access the code with calls to Systems Manager. 
C. Store the credentials in an AWS Systems Manager Parameter Store secure string parameter that is encrypted by AWS Key Management Service (AWS KMS). Access the credentials with calls to Systems Manager. 
D. Use an AWS Key Management Service (AWS KMS) key to encrypt the DB instance at rest. Activate RDS encryption in transit by using SSL certificates. 

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Question # 8

Developers have requested a new Amazon Redshift cluster so they can load new thirdparty marketing data. The new cluster is ready and the user credentials are given to the developers. The developers indicate that their copy jobs fail with the following error message: “Amazon Invalid operation: S3ServiceException:Access Denied,Status 403,Error AccessDenied.” The developers need to load this data soon, so a database specialist must act quickly to solve this issue. What is the MOST secure solution?

A. Create a new IAM role with the same user name as the Amazon Redshift developer user ID. Provide the IAM role with read-only access to Amazon S3 with the assume role action. 
B. Create a new IAM role with read-only access to the Amazon S3 bucket and include the assume role action. Modify the Amazon Redshift cluster to add the IAM role. 
C. Create a new IAM role with read-only access to the Amazon S3 bucket with the assume role action. Add this role to the developer IAM user ID used for the copy job that ended with an error message. 
D. Create a new IAM user with access keys and a new role with read-only access to the Amazon S3 bucket. Add this role to the Amazon Redshift cluster. Change the copy job to use the access keys created. 

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Question # 9

A company's database specialist implements an AWS Database Migration Service (AWS DMS) task for change data capture (CDC) to replicate data from an on- premises Oracle database to Amazon S3. When usage of the company's application increases, the database specialist notices multiple hours of latency with the CDC. Which solutions will reduce this latency? (Choose two.)

A. Configure the DMS task to run in full large binary object (LOB) mode. 
B. Configure the DMS task to run in limited large binary object (LOB) mode. 
C. Create a Multi-AZ replication instance. 
D. Load tables in parallel by creating multiple replication instances for sets of tables that participate in common transactions. 
E. Replicate tables in parallel by creating multiple DMS tasks for sets of tables that do not participate in common transactions. 

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Question # 10

A company plans to migrate a MySQL-based application from an on-premises environment to AWS. The application performs database joins across several tables and uses indexes for faster query response times. The company needs the database to be highly available with automatic failover. Which solution on AWS will meet these requirements with the LEAST operational overhead?

A. Deploy an Amazon RDS DB instance with a read replica. 
B. Deploy an Amazon RDS Multi-AZ DB instance. 
C. Deploy Amazon DynamoDB global tables. 
D. Deploy multiple Amazon RDS DB instances. Use Amazon Route 53 DNS with failover health checks configured. 

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