Microsoft Azure Developer Associate AZ-204 Practice Question
Your company runs an Azure Cosmos DB account that has East US as the single write region and West Europe added as a read region. A microservice that runs only in West Europe must read documents that it previously wrote and must see those writes immediately, but it can tolerate other clients' updates becoming visible later. To keep latency and request units (RU) usage as low as possible, which consistency level should the microservice specify on its SDK requests?
Session consistency guarantees that a client will always read its own writes and reads will honor monotonic reads and writes within the same session token. Because the guarantee is scoped to the caller's session, the database does not have to coordinate all replicas, so it incurs lower latency and RU charges than the globally enforced Strong and Bounded Staleness levels. Eventual and Consistent Prefix offer even lower latency but cannot guarantee that a client will immediately observe its own writes. Therefore, the microservice should set Session consistency for its requests.
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Microsoft Azure Developer Associate AZ-204
Develop for Azure storage
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