Serverless Instance Limitations
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Serverless instances are in a preview release and do not currently support the Atlas features listed below. If you require these capabilities, please use a dedicated cluster.
MongoDB plans to add support for more configurations and capabilities on serverless instances over time. A checkmark below indicates that MongoDB plans to support the feature for serverless instances in the future.
Configurations
Configuration | Coming Soon |
|---|---|
Multi-Region Deployments | |
Multi-Cloud Deployments | |
Sharded Deployments | |
Advanced Enterprise Security Features (including LDAP and Database Auditing) Serverless instances do support X.509 certificates and IAM for authentication. |
Capabilities
Capability | Coming Soon |
|---|---|
Migrate into Clusters from Atlas Serverless instances | |
Live Migrate into Atlas Serverless instances | |
Configure Alerts on Service Metrics Billing Metrics Atlas supports configuring alerts for your project or organization if your bill exceeds a certain threshold. | |
Configure Backups While serverless instances do allow backups, you cannot change the backup policies. | |
Perform Point-in-Time or Automated Restores
from Backup Snapshots | |
Use Atlas Search | |
Use Online Archive | |
Use MongoDB Charts | |
Use Realm Sync | |
Use Triggers | |
Use Predefined Replica Set Tags | |
Track Database Access | |
Use Server-Side JavaScript,
such as $where, $function,
$accumulator and map-reduce | |
Download Database Logs | |
Use Wire Compression Between Clients and Atlas Serverless instances | |
Use BI Connector |
Operational Limitations and Considerations
Additionally, serverless instances have the following operational limitations and considerations:
Operation | Limitation |
|---|---|
Aggregation and Queries | Serverless instances don't support the Serverless instances don't support the $out stage. Use $merge instead. Aggregation fields on serverless instances that represent database and collection names (such as $merge values) can't be expressions. Aggregation pipelines for serverless instances can have a maximum of 50 stages. |
Sort | The $sort stage has
a limit of 32 megabytes of RAM. |
Throughput | Serverless instances don't routinely cap operation throughput. Atlas may
throttle operations for your serverless instance temporarily while the system scales. |
Connections | Serverless instances can support up to 500 simultaneous connections. |
Database Commands | Some database commands have limitations for serverless instances. To learn more, see Unsupported Commands in Serverless Instances. You cannot create a capped collection or convert an existing collection to a capped collection. |
Namespaces and Database Names | Atlas limits serverless instance namespaces to 95 characters and
database names to 38 characters. |
Database and Collections | Serverless instances have a maximum of 50 databases and 500 collections total. |
Custom Roles | Changes to custom roles may
take up to 30 seconds to deploy in serverless instances. |
Reading from the Oplog | Serverless instances don't provide direct
read access to the oplog or any other collection in the local
database. |
Serverless instances don't support change streams. | |
Serverless instances don't support collation on collections,
indexes, or queries. | |
BSON Nested Object Depth | Serverless instances can't store documents with more than 50
nested levels. |
Transaction Size | Serverless instances support multi-document transactions that are up
to 700 MB in size. Atlas aborts any serverless instance transactions that
exceed 700 MB. |
Minimum Driver Versions for Serverless Instances
To connect to your serverless instance using a driver, you must use at least one of the following versions:
Minimum mongosh Version for serverless instances
To connect to serverless instances using mongosh, you must use
version 1.0.0 or later.
You can't connect to serverless instances using the legacy
mongo shell.
Minimum MongoDB Compass Version for serverless instances
To connect to serverless instances using MongoDB Compass, you must use version 1.28 or later.
Minimum MongoDB Tools Version for serverless instances
To import data using the MongoDB Tools, including
mongodump, mongorestore, mongoexport, and mongoimport,
you must have MongoDB Tools version
100.5.x or later.