>
>
>
>Personally, given the current and ever dropping cost of hard disk space
>the selectivity should always be optimized -- i.e. use the new
>structure. The last thing we need to be concerned about is the cost of
>hard disk space -- it is speed that most developers ever care about and
>certainly the key criteria by which an engine is judged.
>

True. However, one should bear in mind that using more hard disk space
to optimize speed can result in more disk I/O. In a client/server
system, the disk is usually next after the network in performance killing.

Marcelo Lopez Ruiz