yes, it's in the DBA Handbook but.... I believe I did see a paper
(with, I think, Cary's name on it. Sorry Cary!) way back when that
discussed OFA and how to set up your disks and it said to put the
indexes in a separate tablespace on a different disk
back before the days of wait event tuning that is
- rgaffuri_at_cox.net wrote:
> does anyoen disagree? Didnt this get started with the 'DBA Handbook'
> or was it a different text?
>
> >
> > From: "Mercadante, Thomas F" <NDATFM_at_labor.state.ny.us>
> > Date: 2003/07/15 Tue AM 11:10:05 EDT
> > To: Multiple recipients of list ORACLE-L <ORACLE-L_at_fatcity.com>
> > Subject: RE: should you seperate indexes from tables in seperate
> datafiles
> >
> > R,
> >
> > Some of it depends on the disk storage. I have always followed the
> > time-proven method of organizing disks and placing indexes away
> from the
> > tables they belong to.
> >
> > Our warehouse is using EMC external disk. What the warehouse
> architect did
> > was to stripe the EMC disks in such a way that all mount points
> (Sun system)
> > are spread across all the EMC disks. What this does is to spread
> all files
> > in the database across all the EMC drives. And with 4 Gig of EMC
> cache
> > available, it further disproves the theory that separing indexes
> from data
> > are required. The end result, in my case, is almost like one big
> RAM disk -
> > where all disk IO is spread across all disk.
> >
> > If you do not have this arrangement, then I would still try and
> keep indexes
> > and data away from each other. But let's face it, we *never* have
> enough
> > disk mount points, so we end up merging things together somewhat
> anyway.
> >
> > hope this helps.
> >
> > Tom Mercadante
> > Oracle Certified Professional
> >
> >
> > -----Original Message-----
> > Sent: Tuesday, July 15, 2003 10:49 AM
> > To: Multiple recipients of list ORACLE-L
> >
> >
> > There has been alot of literature stating that you will recieve
> performance
> > improvements by seperating indexes and tables across multiple I/O
> points.
> >
> > Ie... you have a tables tablespace and an index tablespace. If you
> put them
> > on seperate hard drives, you will have less I/O contention.
> >
> > Now Im seeing some articles stating that this is not true. That
> oracle
> > actually accesses indexes and tables serially. Now it might be
> useful
> > seperate indexes from tables for maintenance purposes but this wont
> lower
> > I/O contention.
> >
> > Can anyone chime in on this? Curious to see where the evidence is
> leading?
> >
> > --
> > Please see the official ORACLE-L FAQ: http://www.orafaq.net
> > --
> > Author: <rgaffuri_at_cox.net
> > INET: rgaffuri_at_cox.net
> >
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> > Author: Mercadante, Thomas F
> > INET: NDATFM_at_labor.state.ny.us
> >
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> Author: <rgaffuri_at_cox.net
> INET: rgaffuri_at_cox.net
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Received on Tue Jul 15 2003 - 09:45:14 CDT
