Oracle FAQ | Your Portal to the Oracle Knowledge Grid |
Home -> Community -> Usenet -> c.d.o.server -> Re: Raw usage in Solaris
"Daniel Morgan" <dmorgan_at_exesolutions.com> wrote in message
news:3CE144F7.3FB7C835_at_exesolutions.com...
> Yong Huang wrote:
>
> > Hi, Nuno,
> >
> > You don't need Veritas or SDS to use raw. In fact, if you do,
that's
> > not called raw any more. To allow oracle to read from the raw
device,
> > run chown oracle:dba [thedevice] as root.
> >
> > Direct I/O may speed up or slow down db file read depending on
whether
> > the file is sequentially read (at OS or filesystem level).
Filesystem
> > page cache helps a lot by prefetch if the read is sequential. But
> > using direct I/O allows you to give the memory that otherwise
would be
> > part of page cache to Oracle buffer cache, which manages Oracle
data
> > caching more intelligently. Read Steve Adams' Ixora News - March
2002
> > newsletter.
> >
> > Yong Huang
> > yong321_at_yahoo.com
>
> Is this available on the web? I can't find anything at ixora.com
that
> points to a newsletter.
>
-- Pablo Sanchez, High-Performance Database Engineering mailto:pablo_at_hpdbe.com http://www.hpdbe.com Available for short-term and long-term contractsReceived on Tue May 14 2002 - 12:26:08 CDT