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Difficulty: MediumAWS Pricing Models

A gaming company is deploying two distinct workloads on Amazon EC2: 1. A backend database cluster for multiplayer matchmaking that must run continuously 24/7 with steady, predictable performance. 2. Batch data processing jobs that analyze game telemetry nightly, can be interrupted at any time, and do not have a strict completion deadline. Which two Amazon EC2 pricing models should the company select to achieve the lowest cost for these workloads? (Select TWO.)

  1. Reserved Instances to host the matchmaking database clusterAnswer
  2. Spot Instances to run the telemetry batch processing jobsAnswer
  3. C
    On-Demand Instances to host the matchmaking database cluster
  4. D
    Spot Instances to host the matchmaking database cluster
  5. E
    On-Demand Instances funded as a Capital Expenditure (CapEx) to run the telemetry batch processing jobs

Answer

The company should select Reserved Instances to host the matchmaking database cluster and Spot Instances to run the telemetry batch processing jobs.
The database cluster requires 24/7 continuous and predictable performance, making Reserved Instances the optimal choice due to their term-commitment discount. The telemetry batch processing jobs can tolerate interruptions and do not have a strict completion window, making Spot Instances the most cost-effective option because they utilize spare AWS capacity at significant discounts.

Step-by-Step Solution

1
Analyze the requirements for the first workload (matchmaking database cluster).
The database requires 24/7 continuous operation with steady, predictable performance.
Since the resource utilization is predictable and constant, the company can commit to a 1-year or 3-year term using Reserved Instances or Savings Plans to optimize costs.
2
Analyze the requirements for the second workload (telemetry batch processing jobs).
The jobs run nightly, can tolerate interruptions, and have no strict completion deadline.
Since these jobs are fault-tolerant and flexible, Spot Instances are the most cost-effective model, offering up to 90% savings by utilizing spare capacity.

Key Concept

AWS EC2 pricing models (Reserved Instances and Spot Instances) match different workload predictability and fault tolerance requirements.
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AWS Pricing Models

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