Exam AZ-300 topic 16 question 29 discussion

Actual exam question from Microsoft's AZ-300

Question #: 29
Topic #: 16

You have an Azure Cosmos DB account named Account1. Account1 includes a database named DB1 that contains a container named Container1. The partition key for Container1 is set to /city.
You plan to change the partition key for Container1.
What should you do first?

A. Regenerate the keys for Account1.
B. Create a new container in DB1.
C. Delete Container1.
D. Implement the Azure Cosmos DB .NET SDK.

Show Suggested Answer

Suggested Answer: B 🗳️
The good news is that there are two features, the Change Feed Processor and Bulk Executor Library, in Azure Cosmos DB that can be leveraged to achieve a live migration of your data from one container to another. This allows you to re-distribute your data to match the desired new partition key scheme, and make the relevant application changes afterwards, thus achieving the effect of "updating your partition key".
Incorrect Answers:
A: It is not possible to "update" your partition key in an existing container.
Reference:
https://devblogs.microsoft.com/cosmosdb/how-to-change-your-partition-key/

by mcitp at Sept. 6, 2020, 12:13 a.m.

Comments

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boras

4 years, 8 months ago

Shouldn't we first remove the existing container?

upvoted 4 times

ihustle

4 years, 7 months ago

The good news is that there are two features, the Change Feed Processor and Bulk Executor Library, in Azure Cosmos DB that can be leveraged to achieve a live migration of your data from one container to another. This allows you to re-distribute your data to match the desired new partition key scheme, and make the relevant application changes afterwards, thus achieving the effect of “updating your partition key”. So you should not delete the old container

upvoted 2 times

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mcitp

4 years, 9 months ago

Correct, there's no way to update the partition key, once it has been created. You will need to create a new container. https://devblogs.microsoft.com/cosmosdb/how-to-change-your-partition-key/

upvoted 3 times

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