2011/9/26 Pitucha, Stanislaw Izaak <stanislaw.pitucha at hp.com>: > The pain starts when your max memory usage crosses what you have available. > Check http://dev.mysql.com/doc/refman/5.1/en/memory-use.html - especially comments which calculate the needed memory for N connections for both innodb and isam. (mysqltuner.pl will also calculate that for you) > > Hundreds of connections should be ok. Thousands... you should rethink it ;) Hm.. It doesn't take many racks full of blade servers to get into 4 digit numbers of compute nodes. Certainly fewer than I was expecting to see in a garden variety Nova zone. -- Soren Hansen | http://linux2go.dk/ Ubuntu Developer | http://www.ubuntu.com/ OpenStack Developer | http://www.openstack.org/