John,
How many databases does a single instance of MySQL Server 5.x support?
I suspect you'll get a bit of a <shrug />, with a 64bit machine there's
a limit of 4.2 billion rows per table and with an XFS file system 8EB
per table, there's a join limit specified somewhere but I don't think
there's an explicit limit coded in anywhere? Assuming you have no other
hardware constraints beyond a 64bit processor (and that's an enormous
assumption) I'd imagine you'd explode one of the tables in the
information_schema database maybe.
Having said all that I suspect that the effort to build a 128bit
processor with working generic *n!x kernel, ANSI C compiler and file
system (minus any 64bit constraints) would dwarf the work then needed to
compile MySQL onto it.
So for the time being I'd suggest that it's safe to assume you'll find
your hardware's limits first.
Regards,
Phil
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