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Amazon DBS-C01 Exam

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Viewing Questions 71 80 out of 125 Questions

Question 71
A company is running a two-tier ecommerce application in one AWS account. The web server is deployed using an Amazon RDS for MySQL Multi-AZ DB instance. A Developer mistakenly deleted the database in the production environment. The database has been restored, but this resulted in hours of downtime and lost revenue.
Which combination of changes in existing IAM policies should a Database Specialist make to prevent an error like this from happening in the future? (Choose three.)
A. Grant least privilege to groups, users, and roles
B. Allow all users to restore a database from a backup that will reduce the overall downtime to restore the database
C. Enable multi-factor authentication for sensitive operations to access sensitive resources and API operations
D. Use policy conditions to restrict access to selective IP addresses
E. Use AccessList Controls policy type to restrict users for database instance deletion
F. Enable AWS CloudTrail logging and Enhanced Monitoring

Question 72
A company is building a new web platform where user requests trigger an AWS Lambda function that performs an insert into an Amazon Aurora MySQL DB cluster. Initial tests with less than 10 users on the new platform yielded successful execution and fast response times. However, upon more extensive tests with the actual target of 3,000 concurrent users, Lambda functions are unable to connect to the DB cluster and receive too many connections errors.
Which of the following will resolve this issue?
A. Edit the my.cnf file for the DB cluster to increase max_connections
B. Increase the instance size of the DB cluster
C. Change the DB cluster to Multi-AZ
D. Increase the number of Aurora Replicas

Question 73
A company is developing a multi-tier web application hosted on AWS using Amazon Aurora as the database. The application needs to be deployed to production and other non-production environments. A Database Specialist needs to specify different MasterUsername and MasterUserPassword properties in the AWSCloudFormation templates used for automated deployment. The CloudFormation templates are version controlled in the company's code repository. The company also needs to meet compliance requirement by routinely rotating its database master password for production.
What is most secure solution to store the master password?
A. Store the master password in a parameter file in each environment. Reference the environment-specific parameter file in the CloudFormation template.
B. Encrypt the master password using an AWS KMS key. Store the encrypted master password in the CloudFormation template.
C. Use the secretsmanager dynamic reference to retrieve the master password stored in AWS Secrets Manager and enable automatic rotation.
D. Use the ssm dynamic reference to retrieve the master password stored in the AWS Systems Manager Parameter Store and enable automatic rotation.

Question 74
A company is writing a new survey application to be used with a weekly televised game show. The application will be available for 2 hours each week. The company expects to receive over 500,000 entries every week, with each survey asking 2-3 multiple choice questions of each user. A Database Specialist needs to select a platform that is highly scalable for a large number of concurrent writes to handle the anticipated volume.
Which AWS services should the Database Specialist consider? (Choose two.)
A. Amazon DynamoDB
B. Amazon Redshift
C. Amazon Neptune
D. Amazon Elasticsearch Service
E. Amazon ElastiCache

Question 75
A company has migrated a single MySQL database to Amazon Aurora. The production data is hosted in a DB cluster in VPC_PROD, and 12 testing environments are hosted in VPC_TEST using the same AWS account. Testing results in minimal changes to the test data. The Development team wants each environment refreshed nightly so each test database contains fresh production data every day.
Which migration approach will be the fastest and most cost-effective to implement?
A. Run the master in Amazon Aurora MySQL. Create 12 clones in VPC_TEST, and script the clones to be deleted and re-created nightly.
B. Run the master in Amazon Aurora MySQL. Take a nightly snapshot, and restore it into 12 databases in VPC_TEST using Aurora Serverless.
C. Run the master in Amazon Aurora MySQL. Create 12 Aurora Replicas in VPC_TEST, and script the replicas to be deleted and re-created nightly.
D. Run the master in Amazon Aurora MySQL using Aurora Serverless. Create 12 clones in VPC_TEST, and script the clones to be deleted and re-created nightly.

Question 76
A large ecommerce company uses Amazon DynamoDB to handle the transactions on its web portal. Traffic patterns throughout the year are usually stable; however, a large event is planned. The company knows that traffic will increase by up to 10 times the normal load over the 3-day event. When sale prices are published during the event, traffic will spike rapidly.
How should a Database Specialist ensure DynamoDB can handle the increased traffic?
A. Ensure the table is always provisioned to meet peak needs
B. Allow burst capacity to handle the additional load
C. Set an AWS Application Auto Scaling policy for the table to handle the increase in traffic
D. Preprovision additional capacity for the known peaks and then reduce the capacity after the event

Question 77
A Database Specialist is migrating an on-premises Microsoft SQL Server application database to Amazon RDS for PostgreSQL using AWS DMS. The application requires minimal downtime when the RDS DB instance goes live.
What change should the Database Specialist make to enable the migration?
A. Configure the on-premises application database to act as a source for an AWS DMS full load with ongoing change data capture (CDC)
B. Configure the AWS DMS replication instance to allow both full load and ongoing change data capture (CDC)
C. Configure the AWS DMS task to generate full logs to allow for ongoing change data capture (CDC)
D. Configure the AWS DMS connections to allow two-way communication to allow for ongoing change data capture (CDC)

Question 78
A financial company has allocated an Amazon RDS MariaDB DB instance with large storage capacity to accommodate migration efforts. Post-migration, the company purged unwanted data from the instance. The company now want to downsize storage to save money. The solution must have the least impact on production and near-zero downtime.
Which solution would meet these requirements?
A. Create a snapshot of the old databases and restore the snapshot with the required storage
B. Create a new RDS DB instance with the required storage and move the databases from the old instances to the new instance using AWS DMS
C. Create a new database using native backup and restore
D. Create a new read replica and make it the primary by terminating the existing primary

Question 79
A large financial services company requires that all data be encrypted in transit. A Developer is attempting to connect to an Amazon RDS DB instance using the company VPC for the first time with credentials provided by a Database Specialist. Other members of the Development team can connect, but this user is consistently receiving an error indicating a communications link failure. The Developer asked the Database Specialist to reset the password a number of times, but the error persists.
Which step should be taken to troubleshoot this issue?
A. Ensure that the database option group for the RDS DB instance allows ingress from the Developer machine's IP address
B. Ensure that the RDS DB instance's subnet group includes a public subnet to allow the Developer to connect
C. Ensure that the RDS DB instance has not reached its maximum connections limit
D. Ensure that the connection is using SSL and is addressing the port where the RDS DB instance is listening for encrypted connections

Question 80
A company is running Amazon RDS for MySQL for its workloads. There is downtime when AWS operating system patches are applied during the Amazon RDS- specified maintenance window.
What is the MOST cost-effective action that should be taken to avoid downtime?
A. Migrate the workloads from Amazon RDS for MySQL to Amazon DynamoDB
B. Enable cross-Region read replicas and direct read traffic to them when Amazon RDS is down
C. Enable a read replica and direct read traffic to it when Amazon RDS is down
D. Enable an Amazon RDS for MySQL Multi-AZ configuration