What are the differences between the Azure Storage Queue and the Azure Service Bus Queue?

Foundational capabilities
Comparison Criteria	Storage queues	Service Bus queues
Ordering guarantee	No For more information, see the first note in the Additional Information section.	Yes - First-In-First-Out (FIFO) (by using message sessions)
Delivery guarantee	At-Least-Once	At-Least-Once (using PeekLock receive mode. It’s the default) At-Most-Once (using ReceiveAndDelete receive mode) Learn more about various Receive modes
Atomic operation support	No	Yes
Receive behavior	Non-blocking (completes immediately if no new message is found)	Blocking with or without a timeout (offers long polling, or the “Comet technique”) Non-blocking (using .NET managed API only)
Push-style API	No	Yes Our .NET, Java, JavaScript, and Go SDKs provide push-style API.
Receive mode	Peek & Lease	Peek & Lock Receive & Delete
Exclusive access mode	Lease-based	Lock-based
Lease/Lock duration	30 seconds (default) 7 days (maximum) (You can renew or release a message lease using the UpdateMessage API.)	30 seconds (default) You can renew the message lock for the same lock duration each time manually or use the automatic lock renewal feature where the client manages lock renewal for you.
Lease/Lock precision	Message level Each message can have a different timeout value, which you can then update as needed while processing the message, by using the UpdateMessage API.	Queue level (each queue has a lock precision applied to all of its messages, but the lock can be renewed as described in the previous row)
Batched receive	Yes (explicitly specifying message count when retrieving messages, up to a maximum of 32 messages)	Yes (implicitly enabling a pre-fetch property or explicitly by using transactions)
Batched send	No	Yes (by using transactions or client-side batching)

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