A Company Caches Session Information for a Web Application in an Amazon

question 293

Multiple Choice

A company caches session information for a web application in an Amazon DynamoDB table. The company wants an automated way to delete old items from the table. What is the simplest way to do this?

• A) Write a script that deletes old records; schedule the scripts as a cron job on an Amazon EC2 instance.
• B) Add an attribute with the expiration time; enable the Time To Live feature based on that attribute.
• C) Each day, create a new table to hold session data; delete the previous day's table.
• D) Add an attribute with the expiration time; name the attribute ItemExpiration . Add an attribute with the expiration time; name the attribute ItemExpiration .

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Definitions:

Dihybrid Cross

Cross between parents that differ in two traits.

Monohybrid Cross

A genetic cross between parents that differ in one characteristic, looking at the inheritance of a single trait.

Punnett Square

Visual representation developed by Reginald Punnett that is used to calculate the expected results of simple genetic crosses.

Phenotypic Ratio

The proportion of different phenotypes observed among offspring in genetic crosses, reflecting genetic variation.