You'll also end up spending at least that much on consultants. While KDB is remarkable in many ways -- the first time I saw it I thought the demo was fake, the performance so great -- it is very difficult to develop in.
They have a an SQLish interface, that allows non-specialists to get work done, but anything serious needs to move beyond that.
I haven't used it in a few years, but queries had to be carefully optimized -- swapping the order in a where clause could cause order of magnitude differences in performance. Also it is append-optimized. If you need to update or insert data, it is a nontrivial exercise.
Regarding being append-only — these days, where reactive programming, immutability and FP are all in vogue, this is a feature. As for the rest, yes — K/Q are idiosyncratic, but they are simpler than it looks at first sight (and second.. and fifth). :)
They have a an SQLish interface, that allows non-specialists to get work done, but anything serious needs to move beyond that.
I haven't used it in a few years, but queries had to be carefully optimized -- swapping the order in a where clause could cause order of magnitude differences in performance. Also it is append-optimized. If you need to update or insert data, it is a nontrivial exercise.