You Need to Choose a Database to Store Time Series

question 42

Multiple Choice

You need to choose a database to store time series CPU and memory usage for millions of computers. You need to store this data in one-second interval samples. Analysts will be performing real-time, ad hoc analytics against the database. You want to avoid being charged for every query executed and ensure that the schema design will allow for future growth of the dataset. Which database and data model should you choose?

• A) Create a table in BigQuery, and append the new samples for CPU and memory to the table
• B) Create a wide table in BigQuery, create a column for the sample value at each second, and update the row with the interval for each second
• C) Create a narrow table in Cloud Bigtable with a row key that combines the Computer Engine computer identifier with the sample time at each second
• D) Create a wide table in Cloud Bigtable with a row key that combines the computer identifier with the sample time at each minute, and combine the values for each second as column data.

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Definitions:

Water Droplets

Small spheres of liquid water formed by condensation or precipitation in the atmosphere.

Atmospheric Pressure

The force per unit area exerted onto a surface by the weight of air above that surface in the Earth's atmosphere.

Altitude

The elevation of a point or object measured from sea level or the surface of the earth.

Collision-Coalescence

A process in cloud formation where water droplets collide and merge to form larger droplets, an essential mechanism in the growth of raindrops.