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From Marcus <>
Subject Maximum number of databases?
Date Sun, 09 Feb 2020 16:02:11 GMT
How many databases can be used without causing issues with replication and server performance?

I found two very different opinions. The pouchdb blog quotes 100K (based on a discussion about
Cloudant in 2014). However a Cloudant blog series from March 2019 recommends a maximum of

Can anyone explain the huge difference? I understand it's going to depend on use cases, but
a difference of 90,500 databases is significant. 

500 are too few when databases are needed for read access control using roles. One for each
user's personal document locker, one for public data (web), and one for a private group. That
leaves about 160 users.

Here are two excerpts from that Cloudant blog series of March 2019.

"Rule 4: Fewer databases are better than many

If you can, limit the number of databases per Cloudant account to 500 or fewer. While there
is nothing magical about this particular number (Cloudant can safely handle more), there are
several use cases that are adversely affected by large numbers of databases in an account."

"Rule 5: Avoid the “database per user” anti-pattern like the plague
If you’re building out a multi-user service on top of Cloudant, it is tempting to let each
user store their data in a separate database under the application account. That works well,
mostly, if the number of users is small."


What are your personal experiences with large numbers of databases?


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