>>>Has any solid research been done in reference to performance after re-indexing before verses after defragmentation of the drive?
>>
>>In addition to degragmentation, you should also consider re-ordering the table to its "natural" order. For example, if you have a table that's ordered by one particular field, re-building that table so that the records are in that order can yield a reduction of index size of up to 20%.
>
>How would this affect the case - the usual case, I believe - where there are several indices, on differente fields or expressions?

I haven't yet tested to see. However, I would think that at least some reduction in size would occur simply because the main index would take up less size.