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Service Bus comes in Basic, Standard and Premium tiers. Here is how they compare:
|ForwardTo / SendVia||–|
|Message Size||256 KB||256 KB||1 MB|
|Brokered connections included||100||1,0001||1,000 per MU|
|Brokered connections (overage allowed)||–||(billable)||Up to 1,000 per MU|
An operation is any API call to the Service Bus service.
|Operations||$- per million operations|
|Base charge 1||$-/mo|
|First 12.5M Ops / Month||Included|
|Next 88M Ops (13M - 100M Ops) / Month||$- per million operations|
|Next 2,400M Ops (100M - 2,500M Ops) / Month||$- per million operations|
|Over 2,500M Ops / Month||$- per million operations|
|Daily||$- fixed rate per Message Unit|
Number of AMQP connections or HTTP calls to Service Bus.
|First 1K / Month||Included|
|Next 99K (1K – 100K) / Month||$- per connection / month|
|Next 400K (100K – 500K) / Month||$- per connection / month|
|Over 500K / Month||$- per connection / month|
|Brokered connections are not charged in the Premium tier.|
Hybrid Connections and WCF RelaysHybrid connections are charged per Listener unit and for any data overage exceeding the included 5GB/Month. WCF Relays are charged by message volume and relay hours.
|Hybrid Connection Pricing|
|Connection Charge (includes 5GB of Data/Month)||$- per Listener|
|Data Transfer Overage (Data exceeding the included 5GB/Month)*||$-/GB|
*The data transfer limit of 5GB covers total data transfer across all listener units.
|WCF Relay Pricing|
|Relay hours||$- for every 100 relay hours|
|Messages||$- for every 10,000 messages|
The monthly prices are calculated based on 744 hours of usage. Connections will be charged in one hour increments.
- How is the Relay Messages meter calculated?
The Relay counts each message sent to the Relay and each message sent by the Relay as billable. A billable message is a data frame of at most 64Kbyte. If a message exceeds 64Kbyte, such as an HTTP reply that returns an image, each further 64Kbyte counts as an additional billable message. For a normal relayed service that implements a request/response scheme, the request first travels to the Relay, then to the service and the reply traverses the same path. That amounts to at least four billable messages. For a multicast service that has 4 listeners, the message sent to the Relay counts as one message and the 4 messages sent to the listeners also each count as a message, resulting in a total of 5 messages.
- How is the Operations meter calculated for queues and topics?
For brokered entities (queues and topics/subscriptions), an operation is any API interaction with Service Bus service on any protocol.
A send, receive delete for a message that is less than or equal to 64KB in size is considered as one billable operation. If the message is greater than 64KB in size, the number of billable operations is calculated according to the message size in multiples of 64KB. For example, an 8 KB message sent to the Service Bus will be billed as one operation, but a 96 KB message sent to the Service Bus will be billed as two operations. Reading the 8KB message with a lock and then completing or explicitly abandoning the message will be billed as two operations. Renewing the lock on a message also incurs an operation.
Multiple deliveries of the same message (for example, message fan out to multiple subscribers or message retrieval after abandon, deferral or dead lettering) will be counted as independent operations. For example, in the case of a topic with three subscriptions, a single 64KB message sent and subsequently received will generate four billable operations, one “in” plus three “out”, assuming all messages are delivered to all subscriptions and deleted during the read.
Additionally creating, reading (listing), updating and deleting a queue, topic or subscription will each incur an operation charge.
Operations are API calls made against queue or topic/subscription service endpoints. This includes Management, Send/Receive and Session State Operations.
Operation Type Description Management Create, read, update, delete against queues or topics/subscriptions Messaging Sending and receiving messages with queues or topics/subscriptions Session state Getting or setting session state on a queue or topic/subscription Premium tier does not charge for Operations up to the purchased capacity limit
- How are Relay hours calculated?
Relay hours are billed for the cumulative amount of time during which each Service Bus Relay is “open”. A Relay is implicitly instantiated and opened at a given Service Bus address (service namespace URL) when a Relay-enabled WCF service or “Relay listener,” first connects to that address. It is closed only when the last listener disconnects from its address. Therefore, for billing purposes a Relay is considered “open” from the time the first Relay listener connects, to the time the last Relay listener disconnects from the Service Bus address of that Relay.
- What is a brokered connection and how do I get charged for them? A brokered connection is defined as one of the following:
- An AMQP connection from a client into a Service Bus topic/subscription, queue or Event Hub.
- An HTTP call to receive a message from a Service Bus topic or queue that has a receive timeout value greater than zero.
Microsoft charges for the peak number of concurrent brokered connections that exceed the included quantity (1,000 in the Standard and Premium tier). Peaks are measured on an hourly basis, prorated by dividing by 744 hours in a month and added up over the monthly billing period. The included quantity (1,000 brokered connections per month) is applied at the end of the billing period against the sum of the prorated hourly peaks.Examples:
- 5,000 clients connect via a single AMQP connection each and receive commands from a Service Bus Topic and send events to Queues. If all clients connect for 12 hours every day, you will see the following connection charges (in addition to any other Service Bus charges): 5,000 connections * 12 hours * 31 days / 744 = 2,500 brokered connections. After the monthly allowance of 1,000 brokered connections, you would be charged for 1,500 brokered connections.
- 5,000 clients receive messages from a Service Bus Queue via HTTP, specifying a non-zero timeout. If all devices connect for 12 hours every day, you will see the following connection charges (in addition to any other Service Bus charges): 5,000 HTTP receive connections * 12 hours per day * 31 days / 744 hours = 2,500 brokered connections.
- Do brokered connection charges apply to queues and topics/subscriptions?
Yes they do. There are no connection charges for sending events using HTTP, regardless of the number of sending systems/devices. Receiving events with HTTP using a timeout greater than zero, sometimes called “long polling”, generate brokered connection charges. AMQP connections generate brokered connection charges regardless of whether the connections are being used to send or receive. Note that 100 brokered connections are allowed at no charge in a Basic namespace (this is also the maximum number of brokered connections allowed for the Azure Subscription). The first 1,000 brokered connections across any/all Standard namespaces in an Azure Subscription are included at no extra charge (beyond the base charge). Since these allowances are enough to cover many service-to-service messaging scenarios, brokered connection charges usually only become relevant if you plan to use AMQP or HTTP long-polling with a large number of clients, i.e. to achieve more efficient event streaming or enable bi-directional communication with thousands/millions of devices or app instances.
- Will I be charged multiple base charges if I have multiple Standard namespaces in my Azure subscription?
No. The Standard base charge is billed only once per month per Azure subscription. This means that after you create a single standard tier Service Bus namespace, you will be able to create as many additional standard tier namespaces as you like under that same Azure subscription without incurring additional base charges.
- How is the Premium tier different from the others?
The Premium tier of Service Bus Messaging provides all the messaging features of Azure Service Bus queues and topics with predictable, repeatable performance, higher throughput and improved availability. The Premium tier uses a dedicated resource allocation model to provide workload isolation and consistent performance. Because the compute and memory resources in the Premium tier are dedicated, there are no per-message transaction charges as in other tiers. All transactions are included in the message unit allocation.
- What is a Messaging Unit?
A Messaging Unit is a set of dedicated resources exclusively reserved for Premium namespaces. This resource set can deliver a consistent and repeatable performance of messaging workloads. Each Premium namespace can have 1, 2 or 4 Messaging Units and the resource allocation grows linearly: 2 Messaging Units is twice as many resources as 1 Messaging Unit.
- How does billing work for the Premium tier?
The Premium tier of Service Bus Messaging is a flat daily rate per Messaging Unit purchased. Namespaces created as Premium can have 1, 2 or 4 Messaging Units which will each accrue the given number of Messaging Unit daily rate charges. Premium namespaces can have the number of purchased Messaging Units changed at any time, but the daily rate is based on the maximum number of Message Units assigned to the namespace at any time.
- Can I upgrade or downgrade between Premium and other tiers?
Yes, it is technically possible to upgrade and downgrade between Premium and other tiers. For guidelines on how to migrate your solution from Standard Messaging to Premium Messaging please read this blog post.
- What is a Hybrid Connection?
A Hybrid Connection allows you to establish bi-directional, binary stream communication between two networked applications, one or both of these parties can reside behind NATs or Firewalls. The “listener” that accepts this “relayed” connection and the “sender” that initiates the connection can both be implemented on any platform and in any language that has a basic WebSocket capability, this includes the WebSocket API in most web browsers.
- How am I billed when I use Hybrid Connections?
When you create your first Hybrid Connection Listener you will be charged at a per Listener Unit rate, the same rate applies to each individual Listener that you decide to create. 5GB of free data transfer per month is included with the service. You can utilise the 5GB of free data transfer across all your listener units. You will be charged for data transfer overage if your aggregate data transfer across all listener units is more than 5GB.
Sample pricing 1: If you have a single listener, such as an instance of the Hybrid Connections Manager installed and continuously running for the entire month and you send 3 GB of data across the connection during the course of the month, your total charge will be $-.
Sample pricing 2: If you have a single listener, such as an instance of the Hybrid Connections Manager installed and continuously running for the entire month and you send 10 GB of data across the connection during the course of the month, your total charge will be $-: $- for the connection and first 5GB + $- for the additional 5GB of data.
Sample pricing 3: If you have a two instances, A and B, of the Hybrid Connections Manager installed and continuously running for the entire month and you send 3 GB of data across connection A and 6 GB across connection B, your total charge will be $-: $- for connection A + $- for connection B + $- for 4GB of data overage (3GB on connection A + 6GB on connection B).
- Is there any data transfer charge to make a connection to the Hybrid Connection Listener?
We will charge 64KB for each connection to your listener. This will be deducted from the 5GB free we offer each month with listener units. The Listener unit charge is calculated per hour in increments of 5 minutes . You will not be charged for multiple opens and closes for dev/test purposes.
- How long will a Hybrid Connection Listener remain open if there is no data transfer? What is the charge to keep the connection open?
If you open a connection and do not transfer any data we will transfer 1KB each minute on your behalf to keep the connection alive. We do this so the network does not auto-close the connection every few minutes. The associated cost to do this for one connected listener is less than $0.05 per month.
Please see this article for additional Service Bus billing FAQs