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NEW QUESTION 27
A business is operating an on-premises application that is divided into three tiers: web, application, and MySQL database. The database is predominantly accessed during business hours, with occasional bursts of activity throughout the day. As part of the company’s shift to AWS, a database expert wants to increase the availability and minimize the cost of the MySQL database tier.
Which MySQL database choice satisfies these criteria?
- A. Amazon RDS for MySQL with Multi-AZ
- B. Amazon RDS for MySQL with read replica
- C. Amazon Aurora MySQL cluster
- D. Amazon Aurora Serverless MySQL cluster
Answer: D
Explanation:
Explanation
Amazon Aurora Serverless v1 is a simple, cost-effective option for infrequent, intermittent, or unpredictable workloads. https://aws.amazon.com/rds/aurora/serverless/
NEW QUESTION 28
A company is using Amazon Aurora PostgreSQL for the backend of its application. The system users are complaining that the responses are slow. A database specialist has determined that the queries to Aurora take longer during peak times. With the Amazon RDS Performance Insights dashboard, the load in the chart for average active sessions is often above the line that denotes maximum CPU usage and the wait state shows that most wait events are IO:XactSync.
What should the company do to resolve these performance issues?
- A. Modify applications to avoid conflicts by taking locks.
- B. Scale up the DB instance class.
- C. Modify applications to commit transactions in batches.
- D. Add an Aurora Replica to scale the read traffic.
Answer: C
Explanation:
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.Reference.html
https://blog.dbi-services.com/aws-aurora-xactsync-batch-commit/
NEW QUESTION 29
An online gaming company is using an Amazon DynamoDB table in on-demand mode to store game scores. After an intensive advertisement campaign in South America, the average number of concurrent users rapidly increases from 100,000 to 500,000 in less than 10 minutes every day around 5 PM.
The on-call software reliability engineer has observed that the application logs contain a high number of DynamoDB throttling exceptions caused by game score insertions around 5 PM. Customer service has also reported that several users are complaining about their scores not being registered.
How should the database administrator remediate this issue at the lowest cost?
- A. Switch the table to provisioned mode and set the throughput to the peak value.
- B. Switch the table to provisioned mode and enable auto scaling.
- C. Enable auto scaling and set the target usage rate to 90%.
- D. Create a DynamoDB Accelerator cluster and use it to access the DynamoDB table.
Answer: B
NEW QUESTION 30
A company has deployed an e-commerce web application in a new AWS account. An Amazon RDS for MySQL Multi-AZ DB instance is part of this deployment with a database-1.xxxxxxxxxxxx.us-east-
1.rds.amazonaws.com endpoint listening on port 3306. The company’s Database Specialist is able to log in to MySQL and run queries from the bastion host using these details.
When users try to utilize the application hosted in the AWS account, they are presented with a generic error message. The application servers are logging a “could not connect to server: Connection times out” error message to Amazon CloudWatch Logs.
What is the cause of this error?
- A. The user name and password the application is using are incorrect.
- B. The security group assigned to the application servers does not have the necessary rules to allow inbound connections from the DB instance.
- C. The security group assigned to the DB instance does not have the necessary rules to allow inbound connections from the application servers.
- D. The user name and password are correct, but the user is not authorized to use the DB instance.
Answer: C
NEW QUESTION 31
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