"Pablo Sanchez" <pablo_at_dev.null> wrote in message
news:Xns933E6690CA881pingottpingottbah_at_216.166.71.233...
> "Gianluca Hotz" <ghotz_at_alphasys.it> wrote in news:b4skjr$237et0$1_at_ID-
> 184953.news.dfncis.de:
>
> > Another thing is that some system, provided there's an index,
> > may "cover" the query fetching densely populated index pages
> > instead of fetching the data pages.
>
> It's unwise for application solutions to rely on 'piggybacking' off of
> indexes. If you can get away with it, that's great but I wouldn't
> bank on it, it's too fragile of a solution.
He never recommended that applications rely on this. He suggested that
writing applications to explicitly request the data they need will sometimes
allow this optimization. Using "SELECT *" indiscriminately will generally
prohibit it.
Received on Fri Mar 14 2003 - 12:25:08 CST
