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---
name: cosmos-provider
description: 'Implementation details for the EF Core Azure Cosmos DB provider. Use when changing Cosmos-specific code.'
user-invocable: false
---
# Cosmos DB Provider
Non-relational provider with its own parallel query pipeline. Uses JSON for document materialization.
## Key Differences from Relational
- No migrations — use `EnsureCreated()`
- Documents as JSON — owned and complex types become embedded objects
- Partition key configuration required for performance
- `ETag` for optimistic concurrency
- No cross-container joins
## Azure Cosmos DB Emulator for Tests
- `TestEnvironment.InitializeAsync()` auto-starts a `Testcontainers.CosmosDb` container when `Test__Cosmos__DefaultConnection` is not set. Set the env var to use an existing emulator instead.
- Skip tests requiring unsupported features on the Linux emulator with ` [ConditionalFact(typeof(CosmosTestEnvironment), nameof(CosmosTestEnvironment.IsNotLinuxEmulator))]`.
