CODEWITHSUNDEEP
azure-cosmosdb
Sathya
Sathya

Reputation: 111

Consistency guarantees of Cosmos DB in local region

I have a cosmos db instance with only one read region and write region. In my case, what do the consistency guarantees provided by Cosmos DB mean?

To be precise, I do a write W to a document. I do a read R on the same document. If I have chosen 'Eventual Consistency', is there a possibility that I see a write older than W even if I have a single read and write region?

Upvotes: 9

Views: 753

Answers (1)

Nick Chapsas
Nick Chapsas

Reputation: 7190

Indeed. The consistency levels aren't just on the georeplication but also the single region.

You can see by the way that Microsoft visualizes the different consistency levels with music notes that (in a single region):

  • Strong and bounded staleness will give you strong consistency on a single region
  • Session will only give you strong consistency within a single session. Anything outsite the session can have stale reads.
  • Consistent Prefix and Eventual can both have stale reads.

Upvotes: 7

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