Azure Event Hubs quotas and limits

This section lists basic quotas and limits in Azure Event Hubs.

The following table lists quotas and limits specific to Azure Event Hubs. For information about Event Hubs pricing, see Event Hubs pricing.

Limit Scope Notes Value
Number of Event Hubs namespaces per subscription Subscription - 100
Number of event hubs per namespace Namespace Subsequent requests for creation of a new event hub are rejected. 10
Number of partitions per event hub Entity - 32
Number of consumer groups per event hub Entity - 20
Number of AMQP connections per namespace Namespace Subsequent requests for additional connections are rejected, and an exception is received by the calling code. 5,000
Maximum size of Event Hubs event Entity - 1 MB
Maximum size of an event hub name Entity - 50 characters
Number of non-epoch receivers per consumer group Entity - 5
Maximum retention period of event data Entity - 1-7 days
Maximum throughput units Namespace Exceeding the throughput unit limit causes your data to be throttled and generates a server busy exception. To request a larger number of throughput units for a Standard tier, file a support request. Additional throughput units are available in blocks of 20 on a committed purchase basis. 20
Number of authorization rules per namespace Namespace Subsequent requests for authorization rule creation are rejected. 12

Next steps

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