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NEW QUESTION 54 A large retail company recently migrated its three-tier ecommerce applications to AWS. The company's backend database is hosted on Amazon Aurora PostgreSQL. During peak times, users complain about longer page load times. A database specialist reviewed Amazon RDS Performance Insights and found a spike in IO:XactSync wait events. The SQL attached to the wait events are all single INSERT statements. How should this issue be resolved?

• A. Add a new Aurora Replica to the Aurora DB cluster.
• B. Change the Aurora DB cluster storage to Provisioned IOPS (PIOPS).
• C. Modify the application to commit transactions in batches
• D. Add an Amazon ElastiCache for Redis cluster and change the application to write through.

Answer: C Explanation: https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/AuroraPostgreSQL.Reference.html "This wait most often arises when there is a very high rate of commit activity on the system. You can sometimes alleviate this wait by modifying applications to commit transactions in batches. " https://docs.aws.amazon.com/AmazonRDS/latest/AuroraUserGuide/apg-waits.xactsync.html   NEW QUESTION 55 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. Ensure the table is always provisioned to meet peak needs
• C. Set an AWS Application Auto Scaling policy for the table to handle the increase in traffic
• D. Allow burst capacity to handle the additional load

Answer: A Explanation: Explanation https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/bp-partition-key-design.html#bp-partition "DynamoDB provides some flexibility in your per-partition throughput provisioning by providing burst capacity. Whenever you're not fully using a partition's throughput, DynamoDB reserves a portion of that unused capacity for later bursts of throughput to handle usage spikes. DynamoDB currently retains up to 5 minutes (300 seconds) of unused read and write capacity. During an occasional burst of read or write activity, these extra capacity units can be consumed quickly-even faster than the per-second provisioned throughput capacity that you've defined for your table. DynamoDB can also consume burst capacity for background maintenance and other tasks without prior notice. Note that these burst capacity details might change in the future."   NEW QUESTION 56 A team of Database Specialists is currently investigating performance issues on an Amazon RDS for MySQL DB instance and is reviewing related metrics. The team wants to narrow the possibilities down to specific database wait events to better understand the situation. How can the Database Specialists accomplish this?

• A. Enable the option to push all database logs to Amazon CloudWatch for advanced analysis
• B. Create appropriate Amazon CloudWatch dashboards to contain specific periods of time
• C. Enable Enhanced Monitoring will the appropriate settings
• D. Enable Amazon RDS Performance Insights and review the appropriate dashboard

Answer: D Explanation: Explanation https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_PerfInsights.Enabling.html https://aws.amazon.com/rds/performance-insights/ https://aws.amazon.com/blogs/database/tuning-amazon-rds-for-mysql-with-performance-insights/   NEW QUESTION 57 An application reads and writes data to an Amazon RDS for MySQL DB instance. A new reporting dashboard needs read-only access to the database. When the application and reports are both under heavy load, the database experiences performance degradation. A database specialist needs to improve the database performance. What should the database specialist do to meet these requirements?

• A. Create a read replica of the DB instance. Configure the application and reports to connect to the cluster endpoint.
• B. Create a read replica of the DB instance. Configure the reports to connect to the replication instance endpoint.
• C. Enable Multi-AZ deployment. Configure the application and reports to connect to the cluster endpoint.
• D. Enable Multi-AZ deployment. Configure the reports to connect to the standby replica.

Answer: B Explanation: https://docs.aws.amazon.com/AmazonRDS/latest/UserGuide/USER_ReadRepl.html   NEW QUESTION 58 ......