Basically separating data and indexes is a special
case of separating disparate IO operations to achieve
sensible load balancing across your IO subsystem.
Its a little obsolete - basically being a throwback to
the days when Oracle did nested loops and not much
else. Nowadays, with operations that could be
parallel, fast full scans, index joins, etc etc, it
could be a more complicated exercise.
Unless you're in a high end environment, a reasonable
compromise is spreading all the database across one or
more stripe sets.
hth
connor
- Jack van Zanen <nlzanen1_at_EY.NL> wrote: > Hi All,
>
>
> I used to learn that due to performance reasons
> (disk head going back and
> forth) indexes need to be seperated from tables
> (different
> disks/controllers).
> Later I have heard other people say that this is not
> an issue because the
> disk head does not stop and wait for you on a
> production system with normal
> activity. The reason for seperating indexes and
> tables now only done for
> administrating purposes.
>
> I tend to lean towards the second opinion but would
> like to have your
> opinion on this
>
>
> TIA
>
>
>
> Jack
>
>
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> --
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> Author: Jack van Zanen
> INET: nlzanen1_at_EY.NL
>
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Received on Mon Mar 04 2002 - 07:48:21 CST
