Choose the right consistency level
Each of the consistency models can be used for specific real-world scenarios. Each provides precise availability and performance tradeoffs backed by comprehensive SLAs. The following simple considerations help you make the right choice in many common scenarios.
Configure the default consistency level
You can configure the default consistency level on your Azure Cosmos DB account at any time. The default consistency level configured on your account applies to all Azure Cosmos DB databases and containers under that account. All reads and queries issued against a container or a database use the specified consistency level by default.
Read consistency applies to a single read operation scoped within a logical partition. The read operation can be issued by a remote client or a stored procedure.
Guarantees associated with consistency levels
Azure Cosmos DB guarantees that 100 percent of read requests meet the consistency guarantee for the consistency level chosen. The precise definitions of the five consistency levels in Azure Cosmos DB using the TLA+ specification language are provided in the azure-cosmos-tla GitHub repo.