Lets see what HA solutions can be designed in mysql and where are they suited.
1. Single master - single slave.
M(RW)|S(R)
A simple master slave solution can be used for a small site - where all the inserts go into the master and some (non-critical) requests are served from the slave. In case if the master crashes, the slave can be simply promoted as the master - once it has replicated the "
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