MongoDB Atlas Free Tier Limits: What You Need to Know
The
MongoDB Atlas free tier offers up to 512 MB of storage, shared RAM, and a maximum of 100 concurrent connections. It supports a single replica set with limited performance suitable for learning and small projects.Syntax
The free tier in MongoDB Atlas is a managed cluster configuration with fixed limits. You create it by selecting the M0 cluster tier during setup. Key parts include:
- Storage: Up to 512 MB of data storage.
- Connections: Maximum 100 concurrent connections.
- Cluster Type: Shared cluster with a single replica set.
- Region: Limited to specific cloud regions.
bash
mongo --host <cluster-url> --username <user> --password <password> --authenticationDatabase admin
Example
This example shows how to connect to a MongoDB Atlas free tier cluster using the mongo shell. Replace placeholders with your cluster details.
bash
mongo --host cluster0-shard-00-00.abcde.mongodb.net:27017 --username myUser --password myPassword --authenticationDatabase admin
Output
MongoDB shell version v5.0.6
connecting to: mongodb://cluster0-shard-00-00.abcde.mongodb.net:27017/admin?replicaSet=atlas-xyz-shard-0&ssl=true
Welcome to the MongoDB shell.
Common Pitfalls
Common mistakes when using the free tier include:
- Exceeding the 512 MB storage limit causes write failures.
- Opening more than 100 concurrent connections leads to connection errors.
- Expecting high performance; free tier is not designed for heavy workloads.
- Trying to add more shards or clusters; free tier supports only one shared cluster.
javascript
/* Wrong: Trying to create multiple clusters on free tier */ // Not allowed in free tier /* Right: Use single M0 cluster for free tier */ // Create one M0 cluster only
Quick Reference
| Feature | Free Tier Limit |
|---|---|
| Storage | 512 MB |
| Connections | 100 concurrent |
| Cluster Type | Single shared replica set |
| RAM | Shared, limited |
| Regions | Selected cloud regions only |
| Sharding | Not supported |
| Backup | No automated backups |
Key Takeaways
MongoDB Atlas free tier offers 512 MB storage and 100 max connections.
It uses a single shared cluster with limited RAM and performance.
Free tier is ideal for learning, development, and small apps only.
Exceeding limits causes errors or degraded performance.
No sharding or automated backups are available on free tier.