Your Weather App Queries a Database Every 15 Minutes to Get

question 145

Multiple Choice

Your weather app queries a database every 15 minutes to get the current temperature. The frontend is powered by Google App Engine and server millions of users. How should you design the frontend to respond to a database failure?

• A) Issue a command to restart the database servers.
• B) Retry the query with exponential backoff, up to a cap of 15 minutes.
• C) Retry the query every second until it comes back online to minimize staleness of data.
• D) Reduce the query frequency to once every hour until the database comes back online.

Understand the difference and purposes of aptitude and achievement tests.

Explain the paradox of choice and its implications.

Describe and understand the concept of the representativeness heuristic and its relation to base rates.

Differentiate between fluid and crystallized intelligence, including their relationship.

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Definitions:

Relative Risk

A measure used in epidemiological research to compare the risk of a certain event occurring in two different groups.

Confidence Interval

A range of values, derived from sample data, that is likely to contain the value of an unknown population parameter.

Large-Sample Method

Statistical methods that rely on the theory of large numbers, allowing for approximation techniques when the sample size is sufficiently large.

Confidence Interval

A statistical range, based on sample data, within which a population parameter is estimated to lie with a certain level of confidence.