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NEW QUESTION 54
A database specialist is working on an Amazon RDS for PostgreSQL DB instance that is experiencing application performance issues due to the addition of new workloads.
The database has SSD of storage space with Provisioned IOPS.
Amazon CloudWatch metrics show that the average disk queue depth is greater than 200 and that the disk I/O response time is significantly higher than usual.
What should the database specialist do to improve the performance of the application immediately?
- A. Use General Purpose SSD (gp2) storage with burst credits.
- B. Increase the available storage space.
- C. Increase the Provisioned IOPS rate on the storage.
- D. Create a read replica to offload Read IOPS from the DB instance.
Answer: C
NEW QUESTION 55
An ecommerce company uses a backend application that stores data in an Amazon DynamoDB table. The backend application runs in a private subnet in a VPC and must connect to this table.
The company must minimize any network latency that results from network connectivity issues, even during periods of heavy application usage. A database administrator also needs the ability to use a private connection to connect to the DynamoDB table from the application.
Which solution will meet these requirements?
- A. Use network ACLs to ensure that any outgoing or incoming connections to any port except DynamoDB are deactivated. Encrypt API calls by using TLS.
- B. Create a VPC endpoint for DynamoDB in the application's VPC. Use the VPC endpoint to access the table.
- C. Use a VPN to route all communication to DynamoDB through the company's own corporate network infrastructure.
- D. Create an AWS Lambda function that has access to DynamoDB. Restrict outgoing access only to this Lambda function from the application.
Answer: B
Explanation:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/vpc-endpoints-dynamodb.html
NEW QUESTION 56
A Database Specialist is migrating a 2 TB Amazon RDS for Oracle DB instance to an RDS for PostgreSQL DB instance using AWS DMS. The source RDS Oracle DB instance is in a VPC in the us-east-1 Region. The target RDS for PostgreSQL DB instance is in a VPC in the use-west-2 Region.
Where should the AWS DMS replication instance be placed for the MOST optimal performance?
- A. In the same VPC and Availability Zone as the source DB instance
- B. In the same Region and VPC as the target DB instance
- C. In the same Region and VPC of the source DB instance
- D. In the same VPC and Availability Zone as the target DB instance
Answer: A
NEW QUESTION 57
A Database Specialist needs to speed up any failover that might occur on an Amazon Aurora PostgreSQL DB cluster. The Aurora DB cluster currently includes the primary instance and three Aurora Replicas.
How can the Database Specialist ensure that failovers occur with the least amount of downtime for the application?
- A. Call the AWS CLI failover-db-cluster command
- B. Enable Enhanced Monitoring on the DB cluster
- C. Start a database activity stream on the DB cluster
- D. Set the TCP keepalive parameters low
Answer: A
NEW QUESTION 58
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