Query Azure CosmosDB from a SQL Server Linked Server

Recently I had a requirement to combine data that I already had in SQL Server (2016) with JSON document data already stored in Azure CosmosDB.  Both databases were operational and continuously accepting data so I didn’t want to go to the trouble of doing the delta load thing between them, instead I just wanted to be able to query directly on demand.

And so – the purpose of this article is to outline the method to connect direct to Azure CosmosDB from SQL Server using a SQL Linked Server.

Finally … SQL & NoSQL … together at last!

For those interested to learn more about Azure CosmosDB, check out my previous blog post here – https://mrfoxsql.wordpress.com/2016/05/11/azure-documentdb-preparing-loading-querying-data/

Or the official documentation here – https://docs.microsoft.com/en-us/azure/cosmos-db/

And so right up front – this solution only works for SQL Server on VM/IaaS – and is not supported for Azure SQL DB (ASDB) – mainly as ASDB doesn’t support SQL Linked Servers! (Damn, they say!)

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