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MySQL & replication "oh, right" moments

We have been running a replicated MySQL setup for many years now. It has been working great for us, but it does make you think of some things in a different way. Not because you're working with a specific function set, but also because of the way the database daemon is constructed, from the ground up, and these little things that add up over time. A recent "oh" moment was regarding MySQL replication lag.
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