Upgrading from MySQL 5.5 to MySQL 5.6 is a fairly straightforward
process. However, the move to version 5.6 does bring with it some
new varaibles with which to work.
One of the recent innovations (pioneered by Percona in Percona
Server 5.5 if I recall correctly) is the ability to "dump" the
innodb buffer pool***. This can be done any time MySQL is running
and can be configured to be executed during MySQL shutdown. One
reason to do this is to have a server "pre-warmed" when you
perform a server restart. Why this is important is that during
server operation the innodb buffer pool will fill up. Typically
the server will operate much better when this buffer pool is full
instead of being empty or paritally full because the return of
data from the buffer pool is much faster than returning data from
disk.
There are four important variables with each having a value of
'ON' or 'OFF'.
innodb_buffer_pool_dump_at_shutdown …
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