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MYSQL Set the cache correctly

innodb_buffer_pool_size should be about 70% of available RAM.


Here are some things that are not likely to help performance. They stem from out-of-date information and/or naivety.

.InnoDB has improved to the point where MyISAM is unlikely to be better.

.PARTITIONing rarely provides performance benefits; it can even hurt performance.

.Setting query_cache_size bigger than 100M will usually hurt performance.

.Increasing lots of values in my.cnf may lead to 'swapping', which is a serious performance problem.

."Prefix indexes" (such as INDEX(foo(20))) are generally useless.

.OPTIMIZE TABLE is almost always useless. (And it involves locking the table.)


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