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Re: 100 instances on same server !!!

From: Dilip Patel <patel_dil_at_msn.com>
Date: Sat, 09 Aug 2003 00:24:30 -0800
Message-ID: <F001.005C9BAA.20030809002430@fatcity.com>


Branimir, Tanel and others Thanks a lot.

I think I will have a Look at FGAC.

Thanks again.

  100 instances is way too much even (especially?) if Win2K is the OS in question.

  Each instance means another service, and each service means spawning and maintaining   multithreaded process... On Windows half of available RAM is taken by default for kernel   processes and the other half is all that all other apps can hope to get. In your case with   4 GB of RAM on the system each of 100 instances will be getting 20 generous MB. Not   enough by any means, not even considering way too many threads that will befell (say   max 4?) CPUs.

  Having said that, le'mee admit a sin: we run with success (meaning nobody complains   about performance) 28 concurrent development instances on powerful (at least it used   to be 4 years ago) 4x450 PIII Xeon CPUs with full 1GB of RAM and 21 x 18 GB HDD in   few RAID 5 containers (sorry for violating BAARF principles). Although we do run overly   large number of instances on a single Windows NT 4 box, in reality most of them are   used sparsely, and that's why getting away with it seems to work.

  Now back to your case - I'd warmly advise to reconsider one box running 100 instances   assumption. Whatever you put there - will likely melt.

  On the other hand if your all 100 of your workstations are same, or form few groups   of same hardware, investing in 512 MB of RAM for each of 100 workstations (should   be much cheaper comparatively) and in 100 licenses (at approx $30 each) for Norton   Ghost Enterprise then:

  Fiddling with Ghost is NOT a DBA job, but any sysadmin type should pull it   with ease (and gratitude, if I may say so ;-).

  Branimir

    -----Original Message-----
    From: Dilip Patel [mailto:patel_dil_at_msn.com]     Sent: Thursday, August 07, 2003 6:54 PM     To: Multiple recipients of list ORACLE-L     Subject: Re: 100 instances on same server !!!

    Thanks for the replies so far. Considering the fact that my database is tiny ( just around 3 GB ), How many of them can work on same server? I can just test with 5 instances, with limited hardware. Will the CPUs be able to take load of 100 instances? Is it worth experimenting this?

    I am on 8.1.7.4 and the application is already built. I stand no chance of changing the code. That is why using individual schemas for individual users is not an option. Right now I am just asked if 100 instances can run on same server and I don't have solid answer.

    Just on side note, can I ask, What is the maximum number of instances anyone has ever worked/heard being installed with in same server?

    Thanks again.

    Dilip.

      100 instances wohhhhh .  If you are in 9i look at possibilities like context
      or label security . or creating another schema .

      -ak



      ----- Original Message ----- 
      To: "Multiple recipients of list ORACLE-L" <ORACLE-L_at_fatcity.com>
      Sent: Wednesday, August 06, 2003 9:24 PM



> I have not heard installing hundred database instances on same server.
> Maybe you should think creating one instance, and then hundred schemas in
> it.
>
> Guang
>
> On Wed, 6 Aug 2003, Dilip Patel wrote:
>
> > Hi All,
> > Need some suggestions/Input.
> >
> > My application database is 8.1.7, NOARCHIVELOG, WIN200,
> > total size 4 GB, more of single user OLTP client-server application.
> >
> > Now the customer wants to give training on this application to hundred
trainees
> > at a time. For this he wants to install hundred database instances on
same
> > server machine, which *each* will be accessed simultaneously from 100
different
> > client workstations.
> >
> > The reasons for installing all instances on same machine are
> > - to avoid re-installing databases on 100 workstations after each round
of
> > training.
> > - No user should see any other user's data.
> >
> > Please suggest if this approach is feasible or is it at all possible.
Tested this with upto 5 instances, and
> > it seems to work. The customer is willing to upgrade to any hardware
needed for
> > this setup.
> >
> > Thanks in advance for your time.
> >
> > Dilip.
> >
>
> --
> Please see the official ORACLE-L FAQ: http://www.orafaq.net
> --
> Author: Guang Mei
> INET: gmei_at_incyte.com
>
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Please see the official ORACLE-L FAQ: http://www.orafaq.net
-- 
Author: Dilip Patel
  INET: patel_dil_at_msn.com

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Received on Sat Aug 09 2003 - 03:24:30 CDT

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