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Re: 5 instances too much ???

From: Peter Shankey <shankeyp_at_its.charlestoncounty.org>
Date: Mon, 23 Apr 2001 17:26:59 GMT
Message-ID: <20010423.17265900@wando.charlestoncounty.org>

While at Oracle school an instructor told me 64 instances.

>>>>>>>>>>>>>>>>>> Original Message <<<<<<<<<<<<<<<<<<

On 4/21/01, 2:57:17 AM, "Daniel A. Morgan" <dmorgan_at_exesolutions.com> wr ote
regarding Re: 5 instances = too much ???:

> You are correct from my standpoint. I don't know of any technical limi
ts.
But when
> it comes to sanity and productivity ... I think there are limits. (Unl
ess
you are a
> contractor billing by the hour in which case you may not care)
 

> Daniel A. Morgan

> Joe Kazimierczyk wrote:
 

> > You make some good points, but I'm not sure if the original
> > poster was asking about technical limits or administrative
> > issues. I don't think there are any technical limits to
> > how many instances a box can support other than the usual
> > capacity issues. From the administrative side, there are
> > pros and cons. It depends on the criticality of the
> > applications, the money they can spend on hardware, and the
> > staff available to support the hardware and software. Here,
> > we have apps where 1 instance per box is the right answer,
> > some apps where many instances per box is perfectly
> > acceptable.
> >
> > "Daniel A. Morgan" wrote:
> > >
> > > I understand. But when the server goes down. All five instances go
 down.
Which
> > > can put a company, or a department, out of business for hours or d
 ays.
> > >
> > > If your company grosses $40 million per year you lose the cost of
a
$100,000
> > > server every 24 hours you are out of business. I doubt there are t
 oo many
> > > companies using Oracle on $100,000 servers that don't make that mu
ch
money
> > > annually. Tell your CFO to do the math.
> > >
> > > Daniel A. Morgan
> > >
> > > Joe Kazimierczyk wrote:
> > >
> > > > It's impossible to give a rule of thumb on this. It all
> > > > depends on the resources consumed by your instances vs what
> > > > your hardware can handle. 5 instances with 2Gb memory
> > > > sounds reasonable if your instances are not big hitters (I
> > > > don't know what 'rational' is - sorry).
> > > >
> > > > > I've never had a machine with more than 3 instances. Now we're
 thinking
> > > > > of going from 3 - 5 instances on a machine that has 2Gig memor
 y. None of
> > > > > the databases are too big- mostly support for apps like ration
 al.
> > > > >
> > > > > So- when do you hit the limit for instances ? Is there a rule
 of thumb ?
> > > > >
Received on Mon Apr 23 2001 - 12:26:59 CDT

Original text of this message

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