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Amazon AWS Certified Database - Specialty (DBS-C01) Exam Sample Questions (Q141-Q146):

NEW QUESTION # 141
A database professional is developing an application that will respond to single-instance requests. The program will query large amounts of client data and offer end users with results.
These reports may include a variety of fields. The database specialist want to enable users to query the database using any of the fields offered.
During peak periods, the database's traffic volume will be significant yet changeable. However, the database will see little activity over the rest of the day.
Which approach will be the most cost-effective in meeting these requirements?

  • A. Amazon DynamoDB with on-demand capacity mode
  • B. Amazon Aurora in a serverless mode
  • C. Amazon Aurora with auto scaling enabled
  • D. Amazon DynamoDB with provisioned capacity mode and auto scaling

Answer: B Explanation:
https://docs.aws.amazon.com/amazondynamodb/latest/developerguide/Limits.html#limits-items
NEW QUESTION # 142
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. Increase the TTL value for keys on the node.
  • B. Choose a larger node type.
  • C. Increase the number of nodes.
  • D. Test different values in the parameter group for the maxmemory-policy parameter to find the ideal value to use.
  • E. Monitor the EngineCPUUtilization Amazon CloudWatch metric. Create an AWS Lambda function to delete keys on nodes when a threshold is reached.
  • F. Reduce the TTL value for keys on the node.

Answer: B,D,F Explanation:
https://aws.amazon.com/premiumsupport/knowledge-center/oom-command-not-allowed-redis/
NEW QUESTION # 143
An online shopping company has a large inflow of shopping requests daily. As a result, there is a consistent load on the company's Amazon RDS database. A database specialist needs to ensure the database is up and running at all times. The database specialist wants an automatic notification system for issues that may cause database downtime or for configuration changes made to the database.
What should the database specialist do to achieve this? (Choose two.)

  • A. Use Amazon SES to send notifications based on configured Amazon CloudWatch Events events.
  • B. Create an Amazon CloudWatch Events event to send a notification using Amazon SNS on every API call logged in AWS CloudTrail.
  • C. Subscribe to an RDS event subscription and configure it to use an Amazon SNS topic to send notifications.
  • D. Enable email notifications for AWS Trusted Advisor.
  • E. Configure Amazon CloudWatch alarms on various metrics, such as FreeStorageSpace for the RDS instance.

Answer: A,C
NEW QUESTION # 144
A huge gaming firm is developing a centralized method for storing the status of various online games' user sessions. The workload requires low-latency key-value storage and will consist of an equal number of reads and writes. Across the games' geographically dispersed user base, data should be written to the AWS Region nearest to the user. The design should reduce the burden associated with managing data replication across Regions.
Which solution satisfies these criteria?

  • A. Amazon Aurora global database
  • B. Amazon RDS for MySQL with multi-Region read replicas
  • C. Amazon DynamoDB global tables
  • D. Amazon RDS for Oracle with GoldenGate

Answer: C Explanation:
Explanation
https://aws.amazon.com/dynamodb/?nc1=hls
NEW QUESTION # 145
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 userid and each game has a unique game_id.
Which choice of keys is recommended for the DynamoDB table?

  • A. Create a global secondary index with game_id as the partition key
  • B. Create a composite primary key with gameid as the partition key and userid as the sort key
  • C. Create a composite primary key with userid as the partition key and gameid as the sort key
  • D. Create a global secondary index with user_id as the partition key

Answer: C Explanation:
https://aws.amazon.com/blogs/database/amazon-dynamodb-gaming-use-cases-and-design-patterns/
"EA uses the user ID as the partition key and primary key (a 1:1 modeling pattern)." https://aws.amazon.com/blogs/database/choosing-the-right-dynamodb-partition-key/
"Partition key and sort key: Referred to as a composite primary key, this type of key is composed of two attributes. The first attribute is the partition key, and the second attribute is the sort key."
NEW QUESTION # 146
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