[tracker1]

It's worth noting that you can split your data among multiple database files (effectively on-disk sharding) to alleviate contention... in-memory record caching and mostly read scenarios will also reduce contention.

There's a LOT you can do with SQLite... not to mention that with simple read caching and reduced writes you can get a lot of performance out of SQLite. Highly interactive web applications, I wouldn't expect to handle more than 50 users on a single system backed by SQLite, as you mention... with SSD, you may get a couple more.

[marcosdumay]

Yes, we start splitting the data at one point. But don't take those 50 users limit too seriously, it was more a consequence of bad networking infrastructure than of SQLite.

I have no idea how far SQLite would go on a nice network with a sane file sharing protocol.

[tracker1]

If you aren't having to do many writes, it will fly for thousands of users... when you have to do a lot of writes, then it will slow to a crawl. I've seen distributed Access based database apps that handled several hundred simultaneous users before.