Discuss Microsoft DP-420 Exam Topic 12 Question 15

You have a container in an Azure Cosmos DB Core (SQL) API account. The container stores telemetry data from IoT devices. The container uses telemetryId as the partition key and has a throughput of 1,000 request units per second (RU/s). Approximately 5,000 IoT devices submit data every five minutes by using the same telemetryId value.

You have an application that performs analytics on the data and frequently reads telemetry data for a single IoT device to perform trend analysis.

The following is a sample of a document in the container.

You need to reduce the amount of request units (RUs) consumed by the analytics application.

What should you do?

ADecrease the offerThroughput value for the container.

BIncrease the offerThroughput value for the container.

CMove the data to a new container that has a partition key of deviceId.

DMove the data to a new container that uses a partition key of date.

Suggested Answer: C

The partition key is what will determine how data is routed in the various partitions by Cosmos DB and needs to make sense in the context of your specific scenario. The IoT Device ID is generally the 'natural' partition key for IoT applications.

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12 comments · newest first

Cristina 11 months ago

Not sure if a date partition key is the best choice for this scenario.

Franchesca 11 months ago

Definitely agree with the idea of changing the partition key.

Aja 12 months ago

Surprised that decreasing throughput is even an option here!

Tiara 12 months ago

I think increasing the throughput won't actually reduce RUs.

Natalya 1 year ago

Moving to a new container with deviceId as the partition key could help.

Wilburn 1 year ago

I vaguely recall that decreasing the offerThroughput value isn't a good idea since it could lead to throttling, but I’m not completely confident about the best approach here.

Muriel 1 year ago

I practiced a similar question where we had to optimize RUs, and I feel like increasing the throughput might just lead to more costs without solving the problem.

Leonor 1 year ago

I remember discussing how partition keys can impact performance, but I'm not sure if changing the partition key to deviceId would really help reduce RUs.

Lazaro 1 year ago

I think moving the data to a new container with a partition key of date could help with query efficiency, but I need to double-check if that would actually reduce RUs.

Gretchen 1 year ago

I'm a little unsure about this one. I know the Spam Quarantine has some LDAP-related settings, but I'm not sure which one specifically handles the end-user authentication. I'll have to review my notes on this topic.

Audry 1 year ago

I remember something about the RPC API for custom gadgets, but I'm not entirely sure if that's one of the key capabilities we should pick.

Lynelle 1 year ago

I'm pretty confident the answer is "pkg". That's the standard package management command on many Linux and Unix-like systems, so it makes sense to use that if the tools aren't installed.

Microsoft DP-420 Exam - Topic 12 Question 15 Discussion