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Re: ASYNCH I/O

From: <tedchyn_at_yahoo.com>
Date: Tue, 06 Jul 1999 17:36:50 GMT
Message-ID: <7lterh$k4u$1@nnrp1.deja.com>


sybrand, what about hp-ux or windownt ? thanks Ted
In article <931120911.20917.0.pluto.d4ee154e_at_news.demon.nl>,   "Sybrand Bakker" <postbus_at_sybrandb.demon.nl> wrote:
> Hi Doug,
> I will use the AIX implementation as example.
> On AIX you both need to enable the asynch I/O feature of the OS and
set
> USE_ASYNCH_IO to true.
> Otherwise it won't work. The two options are complementing each other.
> The basic idea about asynch i/o is the requesting process doesn't
wait for
> the I/O to complete. This does indeed mean having multiple database
writers
> is useless, when async i/o has been enabled. On AIX the operating
system
> itself will create extra writers, the number of writers is variable
and can
> be changed through SMIT.
>
> Hth,
>
> Sybrand Bakker, Oracle DBA
>
> Doug Cowles <dcowles_at_bigfoot.com> wrote in message
> news:377FA9F6.5844956E_at_bigfoot.com...
> > Ran across a statment that multiple database writters are useless
if you
> > are using
> > Asynch I/O. Does this statement apply to OS Asynch I/O, or the
Oracle
> > simulated
> > Asynch I/O created with USE_ASYNCH_IO = true, or is it true at all?
> >
> > Incidentally, can someone shed some light on what this does
> > specifically. In other words,
> > if you are not using Asynch I/O, then database blocks have to be
written
> > out in order?
> > As opposed to whatever the OS finds convenient by disk drive? Or
what?
> >
> > - Dc.
> >
>
>

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Share what you know. Learn what you don't. Received on Tue Jul 06 1999 - 12:36:50 CDT

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