[Spinball]

Originally Posted by mlx

Sure, re-indexing all configured indexes will take some time and might be quite server intense on a database with millions of posts. So are you saying that the paid solution is running "indexer --all --rotate" to re-index all configured indexes every 20 minutes in no time?

Or is it updating the delta indexes every 20 minutes pretty much as described here in 2007?

Honestly I don't know. And that's the point, really. The wife and me own our forums and with the development, marketing and admin jobs I do, I plain don't have the time to understand the details of the search, either the free one here or the paid one. That's why I paid someone else to sort it all out for me.
All I know is that the indexes are updated every 10 minutes and the load on the servers is not significant.
In the free solution running on our forums, it was reindexing every day because that's how I set it up based on what information I could get out of this thread a few months ago. Maybe it wasn't set up as optimally as it could, but then that's because I found this thread to be a bit overwhelming and the instructions a bit complex. Least ways that's how I felt about it.
Most forum admin are not programmers or database experts, or particularly want to be, I would imagine. Or, in many instances, have the funds to pay someone else to do it.

That's why the free plugins released here which install with zero technical ability are so popular.