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DBS-C01 PDF DEMO:
QUESTION NO: 1
A company is running its line of business application on AWS, which uses Amazon RDS for
MySQL at the persistent data store. The company wants to minimize downtime when it migrates the database to Amazon Aurora.
Which migration method should a Database Specialist use?
A. Create a clone of the RDS for MySQL DB instance and promote the Aurora DB cluster.
B. Create an Aurora Replica from the RDS for MySQL DB instance and promote the Aurora DB cluster.
C. Take a snapshot of the RDS for MySQL DB instance and create a new Aurora DB cluster with the option to migrate snapshots.
D. Make a backup of the RDS for MySQL DB instance using the mysqldump utility, create a new
Aurora DB cluster, and restore the backup.
Answer: C
QUESTION NO: 2
An online gaming company is planning to launch a new game with Amazon DynamoDB as its data store. The database should be designated to support the following use cases:
* Update scores in real time whenever a player is playing the game.
* Retrieve a player's score details for a specific game session.
A Database Specialist decides to implement a DynamoDB table. Each player has a unique user_id and each game has a unique game_id.
Which choice of keys is recommended for the DynamoDB table?
A. Create a composite primary key with user_id as the partition key and game_id as the sort key
B. Create a composite primary key with game_id as the partition key and user_id as the sort key
C. Create a global secondary index with user_id as the partition key
D. Create a global secondary index with game_id as the partition key
Answer: C
QUESTION NO: 3
A company is using an Amazon Aurora PostgreSQL DB cluster with an xlarge primary instance master and two large Aurora Replicas for high availability and read-only workload scaling. A failover event occurs and application performance is poor for several minutes. During this time, application servers in all Availability Zones are healthy and responding normally.
What should the company do to eliminate this application performance issue?
A. Deploy an AWS Lambda function that calls the DescribeDBInstances action to establish which instancehas failed, and then use the PromoteReadReplica operation to promote one Aurora Replica to be theprimary DB instance. Configure an Amazon RDS event subscription to send a notification to an AmazonSNS topic to which the Lambda function is subscribed.
B. Configure both Aurora Replicas to have the same instance class as the primary DB instance.
ImplementAurora PostgreSQL DB cluster cache management. Set the failover priority to tier-0 for the primary DBinstance and to tier-1 for the replicas.
C. Configure one Aurora Replica to have the same instance class as the primary DB instance.
ImplementAurora PostgreSQL DB cluster cache management. Set the failover priority to tier-0 for the primary DBinstance and one replica with the same instance class. Set the failover priority to tier-1 for the otherreplicas.
D. Configure both of the Aurora Replicas to the same instance class as the primary DB instance.
Enablecache coherence on the DB cluster, set the primary DB instance failover priority to tier-0, and assign afailover priority of tier-1 to the replicas.
Answer: B
QUESTION NO: 4
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. Preprovision additional capacity for the known peaks and then reduce the capacity after the event
B. Set an AWS Application Auto Scaling policy for the table to handle the increase in traffic
C. Ensure the table is always provisioned to meet peak needs
D. Allow burst capacity to handle the additional load
Answer: D
QUESTION NO: 5
A manufacturing company's website uses an Amazon Aurora PostgreSQL DB cluster.
Which configurations will result in the LEAST application downtime during a failover? (Choose three.)
A. Set Java DNS caching timeouts to a high value.
B. Set JDBC connection string timeout variables to a low value.
C. Create an Amazon CloudWatch alert triggering a restore in another Availability Zone when the primary Aurora DB cluster is unreachable.
D. Set TCP keepalive parameters to a high value.
E. Edit and enable Aurora DB cluster cache management in parameter groups.
F. Use the provided read and write Aurora endpoints to establish a connection to the Aurora DB cluster.
Answer: C,E,F
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Updated: May 28, 2022