When we develop a large-scale application, we must know how much we can scale our database:
| Realtime Database | Cloud Firestore |
| Scaling requires sharding:
Scale to around 100,000 concurrent connections and 1,000 writes/second in a single database. Scaling beyond that requires sharing your data across multiple databases. |
Scaling will be automatic:
Scales completely automatically (after beta), which means that you don't need to share your data across multiple instances. |