Can we create 10000 databases in MongoDB?

[Satyam (Satyam Gupta)]

Hey @Naman1,

Welcome to the MongoDB Community Forums!

There is no hardcoded limit on the number of databases one can create in MongoDB. However, there are other limitations that one needs to be mindful of while creating a database. For example, there is a database limit of 100 if you are planning on using Atlas (M0, M2/M5 tier clusters). You also need to be mindful of your resources like RAM, Memory utilizations, etc.
You can read more on the Documented limits & thresholds in the MongoDB Limits and Thresholds page.

There is also a similar conversation that you might find useful:

Max no. of database

Welcome to the MongoDB community @Avanish_Gupta! The maximum number of databases and collections is a practical limit determined by a combination of factors including your system resources, schema design, workload, and performance expectations. If your working set is significantly larger than available RAM, performance will suffer and eventually become I/O bound shuffling data to and from disk. You can scale a single server vertically (adding more RAM and disk), but it will eventually be more e…

Regards,
Satyam