A Company Has a Multi-Tiered Web Application on AWS

question 252

Multiple Choice

A company has a multi-tiered web application on AWS. During a recent spike in traffic, one of the primary relational databases on Amazon RDS could not serve all the traffic. Some read queries for repeatedly accessed items failed, so users received error messages. What can be done to minimize the impact on database read queries MOST efficiently during future traffic spikes?

• A) Use Amazon S3 to cache database query results.
• B) Use Amazon RDS as a custom origin for Amazon CloudFront.
• C) Use local storage and memory on Amazon EC2 instances to cache data.
• D) Use Amazon ElastiCache in front of the primary database to cache data.

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Definitions:

Double-declining-balance

The double-declining-balance method is a form of accelerated depreciation that doubles the normal depreciation rate, reducing the asset's value more quickly in the early years of its life.

Book Value

The book value of an asset is its original purchase cost minus any accumulated depreciation or amortization, reflecting its recorded value on a company's balance sheet.

Useful Life

The estimated period over which an asset is expected to be usable by a company for its intended purpose.

Capitalize

To record a cost or expense on the balance sheet for the purposes of delaying full recognition of the expense over time through depreciation or amortization.