I separate indexes and tables into different tablespaces for
maintenance purposes, not for performance, as there really is no
performance benefit if you are on a system with multiple users. At any
given time, many users will be doing queries that read the indexes and
many users will be doing queries that read the tables. Besides, I don't
get to control how my disks are set up (part of that "now now little
girl, don't you worry your pretty little head about how the disks are
set up, you just leave that sort of stuff to us big <male> data center
operations people" crap I get)
Maintenance: if I lose an index tablespace datafile, I can just
offline/drop the tablespace and recreate it and the indexes within it
rather than do recovery. My indexes and my tables tend to have
different extent size requirements (most of my indexes are NOT
comprised of all columns in the table) so I separate them for extent
size purposes as well.
- rgaffuri_at_cox.net wrote:
> 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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Received on Tue Jul 15 2003 - 09:04:23 CDT
