Limitations

Atlas Limitations

Atlas limits the number of the following items:

• Components of particular type that you can create.

• Connections allowed to a database deployment. For clusters, the number of connections allowed depends on the cluster tier.

• Shard keys per project. Each Atlas project supports up to 40 unique shard keys. If you require multiple Global Clusters and might exceed this limit, deploy each additional Global Cluster in a separate project.

To learn more, see Atlas Service Limits. For questions or assistance, select Support from the left-hand navigation bar of the Atlas UI to contact support.

Serverless Instance Limitations

Serverless instances don't currently support all of the available Atlas features. MongoDB plans to add support for more configurations and capabilities on serverless instances over time. To learn more, see Serverless Instance Limitations.

Atlas M0 (Free Cluster), M2, and M5 Limitations

Free clusters have certain configuration limitations, operational limitations, and driver requirements. To learn more, see Atlas M0 (Free Cluster), M2, and M5 Limitations.

Unsupported Commands in Atlas

Some commands have limitations on free clusters, or are unsupported on free clusters. Some commands have limitations on M10+ clusters, or are unsupported on M10+ clusters. Also, some commands are unsupported on serverless instances. To learn more, see Unsupported Commands in Atlas.

Commands Available Only in Free Clusters

Atlas supports some commands only on free clusters. To learn more, see Commands Available Only in Free Clusters.