MySQL Performance Tuning Negatives
Example
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 They stem from out-of-date information and/or naivety.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.
PARTITIONingrarely provides performance benefits; it can even hurt performance.- Setting
query_cache_sizebigger than 100M will usually hurt performance. - Increasing lots of values in
my.cnfmay lead to 'swapping', which is a serious performance problem. - "Prefix indexes" (such as
INDEX(foo(20))) are generally useless. OPTIMIZE TABLEis almost always useless. (And it involves locking the table.)
