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AWS Certified Database - Specialty (DBS-C01) Exam問題集を今すぐダウンロード

質問 25
A company runs a customer relationship management (CRM) system that is hosted on-premises with a MySQL database as the backend. A custom stored procedure is used to send email notifications to another system when data is inserted into a table. The company has noticed that the performance of the CRM system has decreased due to database reporting applications used by various teams. The company requires an AWS solution that would reduce maintenance, improve performance, and accommodate the email notification feature.
Which AWS solution meets these requirements?

• A. Use Amazon Aurora MySQL with a read replica for the reporting applications. Configure a stored procedure and an AWS Lambda function to publish a message to an Amazon SNS topic. Subscribe the other system's email address to the topic.
• B. Use MySQL running on an Amazon EC2 instance with a read replica to accommodate the reporting applications. Configure Amazon SES integration to send email notifications to the other system.
• C. Use Amazon Aurora MySQL in a multi-master cluster to accommodate the reporting applications.
  Configure Amazon RDS event subscriptions to publish a message to an Amazon SNS topic and subscribe the other system's email address to the topic.
• D. Use MySQL running on an Amazon EC2 instance with Auto Scaling to accommodate the reporting applications. Configure a stored procedure and an AWS Lambda function that uses Amazon SES to send email notifications to the other system.

正解: A

解説:
Explanation
RDS event subscriptions do not cover "data is inserted into a table" - see
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/USER_Events.Messages.html We can use stored procedure to invoke Lambda function -
https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraMySQL.Integrating.Lambda.html

質問 26
A company just migrated to Amazon Aurora PostgreSQL from an on-premises Oracle database. After the migration, the company discovered there is a period of time every day around 3:00 PM where the response time of the application is noticeably slower. The company has narrowed down the cause of this issue to the database and not the application.
Which set of steps should the Database Specialist take to most efficiently find the problematic PostgreSQL query?

• A. Launch an Amazon EC2 instance, and install and configure an open-source PostgreSQL monitoring toolthat will run reports based on the output error logs.
• B. Modify the logging database parameter to log all the queries related to locking in the database and thencheck the logs after the next slow period for this information.
• C. Enable Amazon RDS Performance Insights on the PostgreSQL database. Use the metrics to identify anyqueries that are related to spikes in the graph during the next slow period.
• D. Create an Amazon CloudWatch dashboard to show the number of connections, CPU usage, and diskspace consumption. Watch these dashboards during the next slow period.

正解: C

質問 27
A company is using an Amazon ElastiCache for Redis cluster to host its online shopping website. Shoppers receive the following error when the website's application queries the cluster:

Which solutions will resolve this memory issues with the LEAST amount of effort? (Choose three.)

• A. Test different values in the parameter group for the maxmemory-policy parameter to find the ideal value to use.
• B. Monitor the EngineCPUUtilization Amazon CloudWatch metric. Create an AWS Lambda function to delete keys on nodes when a threshold is reached.
• C. Reduce the TTL value for keys on the node.
• D. Increase the TTL value for keys on the node.
• E. Increase the number of nodes.
• F. Choose a larger node type.

正解: A,C,F

解説:
https://aws.amazon.com/premiumsupport/knowledge-center/oom-command-not-allowed-redis/

質問 28
A company has a database monitoring solution that uses Amazon CloudWatch for its Amazon RDS for SQL Server environment. The cause of a recent spike in CPU utilization was not determined using the standard metrics that were collected. The CPU spike caused the application to perform poorly, impacting users. A Database Specialist needs to determine what caused the CPU spike.
Which combination of steps should be taken to provide more visibility into the processes and queries running during an increase in CPU load? (Choose two.)

• A. Enable Amazon CloudWatch Events and view the incoming T-SQL statements causing the CPU to spike.
• B. Enable Enhanced Monitoring metrics to view CPU utilization at the RDS SQL Server DB instance level.
• C. Use Amazon QuickSight to view the SQL statement being run.
• D. Implement a caching layer to help with repeated queries on the RDS SQL Server DB instance.
• E. Enable Amazon RDS Performance Insights to view the database load and filter the load by waits, SQL statements, hosts, or users.

正解: B,E

解説:
Explanation
https://aws.amazon.com/premiumsupport/knowledge-center/rds-instance-high-cpu/ "Several factors can cause an increase in CPU utilization. For example, user-initiated heavy workloads, analytic queries, prolonged deadlocks and lock waits, multiple concurrent transactions, long-running transactions, or other processes that utilize CPU resources. First, you can identify the source of the CPU usage by: Using Enhanced Monitoring Using Performance Insights"

質問 29
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