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Exasol loves CentOS.

Let me show you how much they love CentOS:

Exasol and CentOS are alone in TPC-H database performance. There is no other competitive player.

So they charge for their software but deploy it on centos instead of rhel?

Yes, they do, and their TPC-H scores cannot be beaten. CentOS seems a reasonable choice, and likely drives down the TCO.