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See this classic Google Talk by Peter Boncz, the creator of MonetDB (https://en.wikipedia.org/wiki/MonetDB)...

MonetDB/X100: a (very) fast column-store https://www.youtube.com/watch?v=yrLd-3lnZ58

It's nice if you're looking for an alternative to a paid columnar database (ie Vertica, Redshift). I used it on a side project and it performed surprisingly well for large queries (think sum/group by across tens of millions of rows).

Not sure how it works on a production system.

It's over 15 years old.

Still, it suffers from a lack of visibility. I'd only heard about it because one of our DB vendors in the past had mentioned integrating with it.

That said, it's had a lot of interesting development in the last few years (e.g. ocelot which tries to hardware accelerate operations via OpenCL).

yea, I noticed that when I looked at the site. I've still never heard of it.