What is the default behavior when configuring Azure Cosmos DB for replication?

The default behavior when configuring Azure Cosmos DB for replication is that the region where the account was created supports write operations while replicas are read-only. This means that when you set up an Azure Cosmos DB account, you designate a primary region where all write operations occur, ensuring that data consistency and integrity are maintained. The replicas in other regions are configured for read operations only, which allows for efficient data distribution and access while ensuring that writes are centralized in the primary region.

This architecture promotes lower latency for read operations from geographically distributed applications, as users can access data from the nearest replica. It also helps to balance load and minimizes the risk of conflicts that might arise from allowing multiple writable replicas. By understanding this default configuration, users can effectively design their applications to leverage Azure Cosmos DB's capabilities while also adhering to best practices for data management and consistency.