Quotas and Limits

EMQX Platform sets default quotas (or limits) for each deployment and the default value of some of the quotas can be adjusted. The following tables show the default value of the quotas in different deployments and whether they can be adjusted. If you need to adjust the quotas, please contact us.

Serverless

Quotas	Default Value	Adjustable
Maximum internal authentication entries	2000	NO
Maximum internal authorization entries	2000	NO
Anonymous access	No anonymous access	NO
Maximum message queue length	1000	NO
Maximum message size	1 MB	NO
Session expiry time（MQTT 3.x）	2 hours	NO
Maximum retained messages	2000	NO
Maximum size of a retained message	1 MB	NO
Retained message expiry interval	Never	NO
Client ID maximum length（MQTT 3.x）	23	NO
Client ID maximum length（MQTT 5.0）	256	NO
Maximum subscriptions for a single client	10	NO
TCP connect timeout	10s	NO
TLS version	1.2 and 1.3	NO
TLS encryption algorithm	-	NO
Maximum API QPS	100/s	NO
Number of deployments	Up to 2 [*1]	YES
Number of subaccounts	20	NO

[1] Create an extra Serverless deployment by adding a payment method.

Dedicated and BYOC

Quotas	Default Value	Adjustable	Requires Deployment Restart
Maximum internal authentication entries	Session tier * 2 [*1]	-	-
Maximum internal authorization entries	Session tier * 2 [*2]	-	-
External authentication supported at the same time	2	NO	-
Anonymous access	No anonymous access	YES	NO
Maximum message queue length	1000	YES[*3]	NO
Maximum message size	1 MB	YES[*4]	NO
Session expiry time（MQTT 3.x）	2 hours	YES	NO
Maximum retained messages	Session tier * 10	NO	-
Maximum size of a retained message	1 MB	YES	NO
Retained message expiry interval	Never	YES	NO
Client ID maximum length（MQTT 3.x）	23	YES	YES
Client ID maximum length（MQTT 5.0）	256	YES	YES
Maximum API QPS	100/s	NO	-
TCP connect timeout	10s	YES	YES
TLS version	1.2、1.3	NO	YES
TLS encryption algorithm	-	YES	YES
Maximum resources that can be created in Data Integration	10	YES	NO
Maximum rules that can be created in Data Integration	50	YES	NO
Number of deployments	3	YES	NO
Number of subaccounts	20	NO	-

[1] It is recommended to use external authentication if the credentials are more than 100,000.
[2] It is recommended to use external authentication if the credentials are more than 100,000.
[3] The number can be adjusted to the same as the session tier.
[4] The maximum size can be adjusted to 10MB. Due to deployment bandwidth limitations, the maximum TPS will be affected. In case of transmitting 10MB sized MQTT messages, the TPS of the deployed will shrink to 100/s.