A Company Is Migrating a NoSQL Database Cluster to Amazon

question 204

Multiple Choice

A company is migrating a NoSQL database cluster to Amazon EC2. The database automatically replicates data to maintain at least three copies of the data. I/O throughput of the servers is the highest priority. Which instance type should a solutions architect recommend for the migration?

• A) Storage optimized instances with instance store
• B) Burstable general purpose instances with an Amazon Elastic Block Store (Amazon EBS) volume
• C) Memory optimized instances with Amazon Elastic Block Store (Amazon EBS) optimization enabled
• D) Compute optimized instances with Amazon Elastic Block Store (Amazon EBS) optimization enabled

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Definitions:

Standard Normal Table

A reference table that provides the area under the curve of the standard normal distribution, often used to find probabilities and critical values.

Mutually Exclusive Events

Two or more events that cannot occur at the same time, making it impossible for them to happen simultaneously in any given trial.

Probabilities

The quantification of how likely an event is to happen, expressed as a number ranging from 0 to 1, with 0 meaning it cannot occur and 1 meaning it will definitely happen.

Double Counting

An error in calculation or analysis that occurs when the same data or transaction is counted more than once, leading to inaccuracies.