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AWS-Certified-Big-Data-Specialty-BDS-C00 – AWS Certified Big Data - Specialty (BDS-C00)

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Showing 4–6 of 15 questions

Question 4

Your company operates a website for promoters to sell tickets for entertainment events. You are using a load balancer in front of an Auto Scaling group of web server. Promotion of popular events can cause surges of websites visitors. During scaling-out at theses times, newly launched instances are unable to complete configuration quickly enough, leading to user disappointment.

What option should you choose to improve scaling yet minimize costs? Choose 2 answers

Select all that apply, then click Submit answer.

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    Create an AMI with the application pre-configured. Create a new Auto Scaling launch configuration using this new AMI, and configure the Auto Scaling group to launch with this AMI
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    Use Auto Scaling pre-warming to launch instances before they are required. Configure pre- warming to use the CPU trend CloudWatch metric for the group
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    Publish a custom CloudWatch metric from your application on the number of tickets sold, and create an Auto Scaling policy based on this
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    Using the history of past scaling events for similar event sales to predict future scaling requirements. Use the Auto Scaling scheduled scaling feature to vary the size of the fleet
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    Configure an Amazon S3 bucket for website hosting. Upload into the bucket an HTML holding page with its ‘x-amz-website-redirect-location’ metadata property set to the load balancer endpoint. Configure Elastic Load Balancing to redirect to the holding page when the load on web servers is above a certain level
Question 5

When an Auto Scaling group is running in Amazon Elastic Compute Cloud (EC2), your application rapidly scales up and down in response to load within a 10-minutes window; however, after the load peaks, you begin to see problems in your configuration management system where previously terminated Amazon EC2 resources are still showing as active.

What would be a reliable and efficient way to handle the cleanup of Amazon EC2 resources with your configuration management systems?

Choose 2 answers

Select all that apply, then click Submit answer.

  • ○

    Write a script that is run by a daily cron job on an Amazon EC2 instance and that executes API Describe calls of the EC2 Auto Scaling group and removes terminated instances from the configuration management system
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    Configure an Amazon Simple Queue Service (SQS) queue for Auto Scaling actions that has a script that listens for new messages and removes terminated instances from the configuration management system
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    Use your existing configuration management system to control the launching and bootstrapping of instances to reduce the number of moving parts in the automation
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    Write a small script that is run during Amazon EC2 instance shutdown to de-register the resource from





    the configuration management system
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    Use Amazon Simple Workflow Service (SWF) to maintain an Amazon DynamoDB database that contains a whitelist of instances that have been previously launched, and allow the Amazon SWF worker to remove information from the configuration management system
Question 6

An administrator needs to design a distribution strategy for a star schema in a Redshift cluster. The administrator needs to determine the optimal distribution style for the tables in the Redshift schema.

In which three circumstances would choosing Key-based distribution be most appropriate? (Select three)

Select all that apply, then click Submit answer.

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    When the administrator needs to optimize a large, slowly changing dimension table
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    When the administrator needs to reduce cross-node traffic
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    When the administrator needs to optimize the fact table for parity with the number of slices
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    When the administrator needs to balance data distribution and collocation of data
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    When the administrator needs to take advantage of data locality on a local node of joins and aggregates