[lgas]

The context the author is describing is clustered databases, does ZODB offer a clustering option that is equally as mature?

[Feneric]

You mean like ZEO? Yes, it's probably been around for a couple of decades now.

[lgas]

I don't think so. I am referring to something that allows you to scale your database cluster horizontally by adding more servers. ZEO appears to only support a single server.