Re: Why "Separating Data and Indexes improves performance" is a myth?

From: Paul Drake <discgolfdba_at_yahoo.com>
Date: Sat, 24 Apr 2004 20:30:18 -0700 (PDT)
Message-ID: <20040425033018.74169.qmail@web20422.mail.yahoo.com>

Jared Still <jkstill_at_cybcon.com> wrote:
> Jeez Paul, it was just an example. :)
>
> Jared

but when I hear "5 disks", it makes me think of ... dirty things.

I never did try a block size of 6*1024 bytes. it would be interesting for a 6 disk, RAID 10 vol.

I would think that non-power of 2 block sizes would subject the actor with ORA-600s beyond their wildest dreams.

btw - I have not experienced the degredation reported by Jonathan Lewis (~12) regarding not getting 16 blocks per read for full table scans (or 32 when using a dbfmbrc of 32). But I only use powers of 2 for RAID stripes.

>
> On Fri, 2004-04-23 at 18:15, Paul Drake wrote:
> > OOH - odd number of disks for RAID 0 >> BRAIN
> HURTS.
> >
> > These days, I can only do math in my head in
> powers of
> > 2.
> >
> > 2 advil plus a dose of the paper at hotsos on
> > "Aligning Oracle Blocks with Hardware Stripe
> > Boundaries".
> >
> > RAID 1 ( 2 )
> > RAID 10 ( 4, 8)
> > RAID 0 ( 1, 2, 4, 8 )
> >
> > Far better to use that odd number for a hotspare
> > (although a hot spare for RAID 0 is not really
> > worthwhile).
> >
> > RAID F ... sorry, can't do it.
> >
> > Pd

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Received on Sat Apr 24 2004 - 22:27:17 CDT