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From first hand experience, it is much harder to maintain a FOSS environment. It feels like putting more on the line. And I cannot deny that I do it partly out of ideological reasons. So I can totally imagine people being fired for getting in over their heads and messing something up, maybe repeatedly. On the other hand, I've seen techs be banned from a client environment while dealing solely with proprietary softwar…
We're doing an Oracle->PG move at present. I would disagree it's harder. It's trepidatious , but that's not the same. We're in the middle of taking all our internal apps talking to a single huge Oracle database, and giving each app its own cluster of two PG boxes. Nothing has to play nice with anything else - that alone suddenly makes life ridiculously easier. We have expensive paid Oracle support, who do PG as a sid…
We asked Oracle for a quote for two replicated mysql servers for HA. Because they were VMs we got a quote for 3 years that was 410,000 SEK (almost $50k). So we built our own replication solution with mariadb for free.