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Azure Event Hubs quotas and limits
In this article
Common limits for all tiers
Basic vs. standard vs. premium vs. dedicated tiers
What is a guideline for effective informative speaking?
How can you find information about your audience what can you do?
What is the purpose of informative speech?
What type of speech is concerned with explaining an object person event or process?

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Azure Event Hubs quotas and limits

Article
06/17/2022
3 minutes to read

Common limits for all tiers

The following limits are common across all tiers.

Limit	Notes	Value
Size of an event hub name	-	256 characters
Size of a consumer group name	Kafka protocol doesn't require the creation of a consumer group.	Kafka: 256 characters AMQP: 50 characters
Number of non-epoch receivers per consumer group	-	5
Number of authorization rules per namespace	Subsequent requests for authorization rule creation are rejected.	12
Number of calls to the GetRuntimeInformation method	-	50 per second
Number of virtual networks (VNet)	-	128
Number of IP Config rules	-	128
Maximum length of a schema group name		50
Maximum length of a schema name		100
Size in bytes per schema		1 MB
Number of properties per schema group		1024
Size in bytes per schema group property key		256
Size in bytes per schema group property value		1024

Basic vs. standard vs. premium vs. dedicated tiers

The following table shows limits that may be different for basic, standard, premium, and dedicated tiers.

Note

In the table, CU is capacity unit, PU is processing unit, and TU is throughput unit.
You can configure TUs for a basic or standard tier namespace or PUs for a premium tier namespace.
When you create a dedicated cluster, 1 CU is assigned to the cluster. If you enable the Support Scaling option while creating the cluster, you'll be able to scale out by increasing CUs or scale in by decreasing CUs for the cluster yourself. For step-by-step instructions, see Scale dedicated cluster. For clusters that don't support the Support Scaling feature, submit a ticket To adjust CUs for the cluster.

Limit	Basic	Standard	Premium	Dedicated
Maximum size of Event Hubs publication	256 KB	1 MB	1 MB	1 MB
Number of consumer groups per event hub	1	20	100	1000 No limit per CU
Number of brokered connections per namespace	100	5,000	10000 per PU For example, if the namespace is assigned 3 PUs, the limit is 30000.	100, 000 per CU
Maximum retention period of event data	1 day	7 days	90 days	90 days
Maximum TUs or PUs or CUs	40 TUs	40 TUs	16 PUs	20 CUs
Number of partitions per event hub	32	32	100 per event hub, but there's a limit of 200 per PU at the namespace level. For example, if a namespace is assigned 2 PUs, the limit for total number of partitions in all event hubs in the namespace is 2 * 200 = 400.	1024 per event hub 2000 per CU
Number of namespaces per subscription	1000	1000	1000	1000 (50 per CU)
Number of event hubs per namespace	10	10	100 per PU	1000
Capture	N/A	Pay per hour	Included	Included
Size of the schema registry (namespace) in mega bytes	N/A	25	100	1024
Number of schema groups in a schema registry or namespace	N/A	1 - excluding the default group	100 1 MB per schema	1000 1 MB per schema
Number of schema versions across all schema groups	N/A	25	1000	10000
Throughput per unit	Ingress - 1 MB/s or 1000 events per second Egress – 2 MB/s or 4096 events per second	Ingress - 1 MB/s or 1000 events per second Egress – 2 MB/s or 4096 events per second	No limits per PU *	No limits per CU *

* Depends on various factors such as resource allocation, number of partitions, storage, and so on.

Note

You can publish events individually or batched. The publication limit (according to SKU) applies regardless of whether it is a single event or a batch. Publishing events larger than the maximum threshold will be rejected.

The following table shows the list of features that are available (or not available) in a specific tier of Azure Event Hubs.

Feature	Basic	Standard	Premium	Dedicated
Tenancy	Multi-tenant	Multi-tenant	Multi-tenant with resource isolation	Exclusive single tenant
Private link	N/A	Yes	Yes	Yes
Customer-managed key (Bring your own key)	N/A	N/A	Yes	Yes
Capture	N/A	Priced separately	Included	Included
Dynamic Partition scale out	N/A	N/A	Yes	Yes
Ingress events	Pay per million events	Pay per million events	Included	Included

Note

Included in the table means the feature is available and there's no separate charge for using it.

Next steps

You can learn more about Event Hubs by visiting the following links:

Event Hubs overview
Event Hubs Auto-inflate
Event Hubs FAQ

Feedback

Submit and view feedback for

What is a guideline for effective informative speaking?

There are three criteria for effective informative speaking. The information should be communicated clearly. The information should be communicated accurately. The information should be meaningful and interesting to the audience.

How can you find information about your audience what can you do?

How to Know Your Audience.

Review any current data and analytics..

Look to previous successes among your audience..

Create buyer personas..

Conduct surveys..

Keep an eye on your competitors..

Monitor audience feedback, comments, and engagements..

Experiment with content and updates to your products and services..

What is the purpose of informative speech?

The purpose of the informative speech is to provide interesting, useful, and unique information to your audience. By dedicating yourself to the goals of providing information and appealing to your audience, you can take a positive step toward succeeding in your efforts as an informative speaker.

What type of speech is concerned with explaining an object person event or process?

Speeches about objects, processes, events, and concepts are the most common type of informative speech.

There is no limit to the amount of information that a listener can take in at any one time.

Azure Event Hubs quotas and limits

In this article

Common limits for all tiers

Basic vs. standard vs. premium vs. dedicated tiers

Next steps

Feedback

What is a guideline for effective informative speaking?

How can you find information about your audience what can you do?

What is the purpose of informative speech?

What type of speech is concerned with explaining an object person event or process?

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