Azure Cosmos DB each partition size limit

Question

In Azure Cosmos DB partinioned collection, does each partition has any size limit?

As per this old document, they have a size limit of 10 GB. Is that the same now also?

https://azure.microsoft.com/en-in/blog/10-things-to-know-about-documentdb-partitioned-collections/

Regards, Karthikeyan V.

Answer 1

A partitioned collection has individual 10GB partition spaces. For a given partition key, you cannot exceed 10GB of data. This has not changed.

You'll need to pick a partition key which distributes your data across many partitions, vs creating "hot" partitions which could fill up (where you'd then get an error when attempting to write content).

Answer 2

There are two type of collection

• Single Partition Collection (10GB and 10,000 RU/s)
• Partitioned Collection (250 GB and 250,000 RU/s)- you can increase the limit as needed after contacting azure team.

For partitioned collection you mush have to specify a partition key based on your query filter for better read performance and if you will not mention it will be by default single partition collection.

Note: Collection is a logical space and it can span across multiple node(hence quorum) in background based on the RU and other param, in short it's a PAAS and the infra handling is automated behind the screen, you will not have much control over it.

More info here:

Partitioning and horizontal scaling in Azure Cosmos DB