(mysql.info) update-speed

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 7.2.17 Speed of `UPDATE' Statements
 -----------------------------------
 
 An update statement is optimized like a `SELECT' query with the
 additional overhead of a write. The speed of the write depends on the
 amount of data being updated and the number of indexes that are updated.
 Indexes that are not changed do not get updated.
 
 Another way to get fast updates is to delay updates and then do many
 updates in a row later. Performing multiple updates together is much
 quicker than doing one at a time if you lock the table.
 
 For a `MyISAM' table that uses dynamic row format, updating a row to a
 longer total length may split the row. If you do this often, it is very
 important to use `OPTIMIZE TABLE' occasionally. See 
 optimize-table.
 

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