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Atlas Limitations¶
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Atlas limits how many of each kind of component you can create, and the number of connections allowed to a cluster based on cluster tier. These tables outline component and connection limits.
Important
If any of these limits present a problem for your organization, please contact Atlas support.
Cluster Limits¶
| Component | Limit |
|---|---|
| Shards in Multi-Region Clusters | 12 |
| Shards in Single-region clusters | 50 |
| Total Nodes per Region of a Multi-Region Cluster | 40 |
| Electable Nodes per Region | 7 |
| Config Server Tier (minimum and maximum) | M30 |
Connection Limits and Cluster Tier¶
Atlas sets the limits for concurrent incoming connections based on the cluster tier:
| Cluster Tier | Maximum Number of Concurrent Incoming Connections |
|---|---|
M0 |
500 |
M2 |
500 |
M5 |
500 |
M10 |
1500 |
M20 |
3000 |
M30 |
3000 |
M40 / M40 Low CPU * |
6000 |
M50 / M50 Low CPU * |
16000 |
M60 / M60 Low CPU * |
32000 |
M80 Low CPU * |
64000 |
M140 |
96000 |
M200 / M200 Low CPU * |
128000 |
M300 |
128000 |
M400 Low CPU * |
128000 |
* Low CPU tiers are available with AWS clusters only.
Note
Atlas reserves a small portion of connections to each Atlas cluster for supporting Atlas services. Contact Atlas support for more information on Atlas reserved connections.
Organization and Project Limits¶
| Component | Limit |
|---|---|
| Total Network Peering Connections per Atlas Project | 50 Note Atlas limits the number of nodes per Network Peering connection based on the CIDR block and the region selected for the project. |
| Pending Network Peering Connections per Atlas Project | 25 |
| Database Users per Atlas Project | 100 |
| Atlas Users per Atlas Project | 500 |
| Atlas Users per Atlas Organization | 500 |
| API Keys per Atlas Organization | 500 |
| Whitelist Entries per Atlas Project | 200 |
| Users per Atlas Team | 250 |
| Teams per Atlas Project | 100 |
| Teams per Atlas Organization | 250 |
| Teams per Atlas User | 100 |
| Organizations per Atlas User | 250 |
| Clusters per Atlas Project | 25 |
| Projects per Atlas Organization | 250 |
| Custom MongoDB roles per Atlas Project | 100 |
| Assigned Roles per Database User | 100 |
| Hourly Billing per Atlas Project | $50 Note A Technical Account Manager or Billing Admin can raise this limit. |
| Data Lake Tenants per Atlas User | 25 |
Label Limits¶
Atlas also limits how long particular labels of components can be.
| Component | Character Length Limit |
|---|---|
| AWS Cluster Name | 33 |
| GCP Cluster Name | 29 |
| Azure Cluster Name | 27 |
| API Key Description | 250 |