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Amazon Web Services DBS-C01 Exam Sample Questions

Question # 1

A business's production databases are housed on a 3 TB Amazon Aurora MySQL DB cluster. The database cluster is installed in the region us-east-1. For disaster recovery (DR) requirements, the company's database expert needs to fast deploy the DB cluster in another AWS Region to handle the production load with an RTO of less than two hours. Which approach is the MOST OPERATIONALLY EFFECTIVE in meeting these requirements?

A. Implement an AWS Lambda function to take a snapshot of the production DB cluster every 2 hours, and copy that snapshot to an Amazon S3 bucket in the DR Region. Restore the snapshot to an appropriately sized DB cluster in the DR Region.

B. Add a cross-Region read replica in the DR Region with the same instance type as the current primary instance. If the read replica in the DR Region needs to be used for production, promote the read replica to become a standalone DB cluster.

C. Create a smaller DB cluster in the DR Region. Configure an AWS Database Migration Service (AWS DMS) task with change data capture (CDC) enabled to replicate data from the current production DB cluster to the DB cluster in the DR Region.

D. Create an Aurora global database that spans two Regions. Use AWS Database Migration Service (AWS DMS) to migrate the existing database to the new global database.

Answer

B.

Add a cross-Region read replica in the DR Region with the same instance type as the
current primary instance. If the read replica in the DR Region needs to be used for
production, promote the read replica to become a standalone DB cluster.

Explanation: RTO is 2 hours. With 3 TB database, cross-region replica is a better option

---

Question # 2

A company has an ecommerce web application with an Amazon RDS for MySQL DB instance. The marketing team has noticed some unexpected updates to the product and pricing information on the website, which is impacting sales targets. The marketing team wants a database specialist to audit future database activity to help identify how and when the changes are being made. What should the database specialist do to meet these requirements? (Choose two.)

A. Create an RDS event subscription to the audit event type

B. Enable auditing of CONNECT and QUERY_DML events

C. SSH to the DB instance and review the database logs

D. Publish the database logs to Amazon CloudWatch Logs.

E. Enable Enhanced Monitoring on the DB instance.

Answer

B.

Enable auditing of CONNECT and QUERY_DML events

D.

Publish the database logs to Amazon CloudWatch Logs.

Explanation: https://aws.amazon.com/blogs/database/configuring-an-audit-log-to-capturedatabase-
activities-for-amazon-rds-for-mysql-and-amazon-aurora-with-mysql-compatibility/

---

Question # 3

A company developed a new application that is deployed on Amazon EC2 instances behind an Application Load Balancer. The EC2 instances use the security group named sgapplication- servers. The company needs a database to store the data from the application and decides to use an Amazon RDS for MySQL DB instance. The DB instance is deployed in private DB subnet. What is the MOST restrictive configuration for the DB instance security group?

A. Only allow incoming traffic from the sg-application-servers security group on port 3306.

B. Only allow incoming traffic from the sg-application-servers security group on port 443.

C. Only allow incoming traffic from the subnet of the application servers on port 3306.

D. Only allow incoming traffic from the subnet of the application servers on port 443.

Answer

A.

Only allow incoming traffic from the sg-application-servers security group on port 3306.

Explanation: most restrictive approach is to allow only incoming connections from SG of
EC2 instance on port 3306

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Question # 4

On a single Amazon RDS DB instance, a business hosts a MySQL database for its ecommerce application. Automatically saving application purchases to the database results in high-volume writes. Employees routinely create purchase reports for the company. The organization wants to boost database performance and minimize downtime associated with upgrade patching. Which technique will satisfy these criteria with the LEAST amount of operational overhead?

A. Enable a Multi-AZ deployment of the RDS for MySQL DB instance, and enable Memcached in the MySQL option group.

B. Enable a Multi-AZ deployment of the RDS for MySQL DB instance, and set up replication to a MySQL DB instance running on Amazon EC2

C. Enable a Multi-AZ deployment of the RDS for MySQL DB instance, and add a read replica.

D. Add a read replica and promote it to an Amazon Aurora MySQL DB cluster master. Then enable Amazon Aurora Serverless

Answer

C.

Enable a Multi-AZ deployment of the RDS for MySQL DB instance, and add a read
replica.

---

Question # 5

A company is building a software as a service application. As part of the new user sign-on workflow, a Python script invokes the CreateTable operation using the Amazon DynamoDB API. After the call returns, the script attempts to call PutItem. Occasionally, the PutItem request fails with a ResourceNotFoundException error, which causes the workflow to fail. The development team has confirmed that the same table name is used in the two API calls. How should a database specialist fix this issue?

A. Add an allow statement for the dynamodb:PutItem action in a policy attached to the role used by the application creating the table.

B. Set the StreamEnabled property of the StreamSpecification parameter to true, then call PutItem.

C. Change the application to call DescribeTable periodically until the TableStatus is ACTIVE, then call PutItem.

D. Add a ConditionExpression parameter in the PutItem request

Answer

C.

Change the application to call DescribeTable periodically until the TableStatus is
ACTIVE, then call PutItem.

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