How do you optimize performance for Cosmos DB in a .NET app?

Short answer: Choose appropriate partition key Use asynchronous SDK methods Enable RU-based throughput scaling Cache frequently accessed data using Redis Cache Example in .NET SDK: var container = cosmosClient.GetContainer("db", "container"); var query = new QueryDefinition("SELECT * FROM c WHERE c.status = @status") .WithParameter("@status", "Active"); var iterator = container.GetItemQueryIterator<MyItem>(query);

Real-world example (ShopNest)

ShopNest on Azure typically uses App Service + SQL Database + Blob Storage + Application Insights for monitoring.

Say this in the interview

1. Define — one clear sentence (the short answer above).
2. Example — relate it to a project like ShopNest or your real work.
3. Trade-off — when you would not use it.