It’s not even technical reasons my org has loads of oracle it’s compliance. We have to have vendor support for the data layer for certain financial applications which leaves us with only the companies willing to do the insane dance that is involved in getting vendor certified with my bank (6 months on avg, hundreds of pages of legal documents).

It narrows the field, at least for us, to microsoft, ibm, oracle and mongo.

So we’re all in on mongo, as it goes, but I wouldn’t really balk at running some stuff on the giant oracle clusters now and again.