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Amazon AWS Certified Database - Specialty (DBS-C01) Exam Sample Questions (Q239-Q244):

NEW QUESTION # 239
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?

• A. 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.
• B. 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.
• C. 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.
• D. 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.

Answer: B
NEW QUESTION # 240
The website of a manufacturing firm makes use of an Amazon Aurora PostgreSQL database cluster.
Which settings will result in the LEAST amount of downtime for the application during failover? (Select three.)

• A. Use the provided read and write Aurora endpoints to establish a connection to the Aurora DB cluster.
• B. Create an Amazon CloudWatch alert triggering a restore in another Availability Zone when the primary Aurora DB cluster is unreachable.
• C. Set Java DNS caching timeouts to a high value.
• D. Set JDBC connection string timeout variables to a low value.
• E. Set TCP keepalive parameters to a high value.
• F. Edit and enable Aurora DB cluster cache management in parameter groups.

Answer: A,D,F Explanation:
Explanation
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.BestPractices.html
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.cluster-cache-mgmt.htm
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.BestPractices.html#Auro
NEW QUESTION # 241
Recently, an ecommerce business transferred one of its SQL Server databases to an Amazon RDS for SQL Server Enterprise Edition database instance. The corporation anticipates an increase in read traffic as a result of an approaching sale. To accommodate the projected read load, a database professional must establish a read replica of the database instance.
Which procedures should the database professional do prior to establishing the read replica? (Select two.)

• A. Modify the read replica parameter group setting and set the value to 1.
• B. Ensure that the source DB instance is a Multi-AZ deployment with SQL Server Database Mirroring (DBM).
• C. Identify a potential downtime window and stop the application calls to the source DB instance.
• D. Ensure that the source DB instance is a Multi-AZ deployment with Always ON Availability Groups.
• E. Ensure that automatic backups are enabled for the source DB instance.

Answer: D,E Explanation:
Explanation
https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/SQLServer.ReadReplicas.html
NEW QUESTION # 242
A company has migrated a single MySQL database to Amazon Auror
a. The production data is hosted in a DB cluster in VPCPROD, and 12 testing environments are hosted in VPCTEST 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 using Aurora Serverless. Create 12 clones in VPC_TEST, and script the clones to be deleted and re-created nightly.
• 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. Take a nightly snapshot, and restore it into 12 databases in VPC_TEST using Aurora Serverless.

Answer: A
NEW QUESTION # 243
A company developed an AWS CloudFormation template used to create all new Amazon DynamoDB tables in its AWS account. The template configures provisioned throughput capacity using hard-coded values. The company wants to change the template so that the tables it creates in the future have independently configurable read and write capacity units assigned.
Which solution will enable this change?

• A. Add values for two Number parameters, rcuCount and wcuCount, to the template. Replace the hard-coded values with calls to the Ref intrinsic function, referencing the new parameters.
• B. Add values for the rcuCount and wcuCount parameters as outputs of the template. Configure DynamoDB to provision throughput capacity using the stack outputs.
• C. Add values for the rcuCount and wcuCount parameters to the Mappings section of the template. Configure DynamoDB to provision throughput capacity using the stack's mappings.
• D. Add values for the rcuCount and wcuCount parameters to the Mappings section of the template. Replace the hard-coded values with calls to the Ref intrinsic function, referencing the new parameters.

Answer: A
NEW QUESTION # 244
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