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7.2.15 Speed of `UPDATE' Statements
-----------------------------------
Update statements are optimized as 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 will not be updated.
Also, another way to get fast updates is to delay updates and then do
many updates in a row later. Doing many updates in a row is much quicker
than doing one at a time if you lock the table.
Note that for a `MyISAM' table that uses dynamic record format,
updating a record to a longer total length may split the record. If
you do this often, it is very important to use `OPTIMIZE TABLE'
occasionally. `OPTIMIZE TABLE' OPTIMIZE TABLE.
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