AWS Certified Big Data – Specialty — Question 14

A system needs to collect on-premises application spool files into a persistent storage layer in AWS. Each spool file is 2 KB. The application generates 1 M files per hour. Each source file is automatically deleted from the local server after an hour.
What is the most cost-efficient option to meet these requirements?

Answer options

• A. Write file contents to an Amazon DynamoDB table.
• B. Copy files to Amazon S3 Standard Storage.
• C. Write file contents to Amazon ElastiCache.
• D. Copy files to Amazon S3 infrequent Access Storage.

Correct answer: C

Explanation

The correct choice, writing file contents to Amazon ElastiCache, is appropriate for high-speed access and temporary storage of frequently accessed data. Other options like Amazon DynamoDB and S3 Standard Storage incur higher costs for the volume of data being processed, while S3 Infrequent Access is not as suitable due to the files being deleted after a short duration, making ElastiCache the most cost-efficient option.