In the last episode (Mar 21), Viraj Alankar said:
> I'm confused as to what 'delete quick' does and when to use it. The
> manual states:
> If you specify the word QUICK then the table handler will not merge
> index leafs during delete, which may speed up certain kind of
Normally when you delete an entry from an index, if the deletion causes
an index block to become half-empty (or 25%, or whatever; depends on
the algorithm), mysql will start coalescing index blocks. This results
in a smaller, more efficient index.
If you are simply deleting a bunch of records only to re-insert new
ones, there's not much use in trying to optimize the index halfway
through the operation.