> MySQL's clustering capabilities are limited to databases that fit in RAM. > Will the database fit in RAM?
That automagic clustering code (NDB) is still very much experimental. I have a strong suspicion it may stay that way for a while - at least I have not seen very strong evidence to the contrary so far. Ignore it for at least another year as far as practical clustering solutions are concerned.
MySQL can cluster with regular tables, although not automagically. You need to write your application code with multiple servers in mind, which is not that hard to do from the start, but near impossible if you already have an application not built for it. However, if you do not have an application yet, this should not be a problem.
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