no problem for me... 1000+ DBs on RH linux (ext3 fs), then moved it to freebsd 5.1 (almost 1500). Linux is probably faster because of the kernel based thread, but I like BSD.

You definetely have to tune your my.cnf... use thread and query cache, increase the key buffer, optimize tables very often (I do it every day... takes 7 minutes in a dual xeon 2Ghz), increase sort and join size.

good luck

Harald Fuchs wrote:
In article <[EMAIL PROTECTED]>,
"Richard" <[EMAIL PROTECTED]> writes:


Does anybody know of any issues when have a large (+1000) databases in
MySQL?
It will be running on RedHat 9. Would there be any problems running backups
with this many DBs on
one box?


Some filesystems become slow if you have +1000 subdirectories.
ReiserFS doesn't have that problem.



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