Upgrading MySQL with Replication
Short version is you replicate to another server switch to it, upgrade, then switch back.
"You can keep the outage to only a few minutes while performing this upgrade, removing the need for potentially expensive downtime. If you need the downtime to be zero, you probably want to be looking at a Circular Replication system, though thatís getting a little outside of this blog post." Upgrading MySQL with minimal downtime through Replication
(Submitted by Noel Thu Feb 26, 2009 )
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