Re: Maximum Instances in a Unix Server

Hi Jordi,

I have been in such a situation (four increasing to six) and basically there are only three issues

- physical memory
- physical memory
- physical memory

As we didn't have that (only 256M on a RS6000 with four instances), virtual memory became the problem. The system was paging and swapping heavily. You can't share the SGA and if you have a database of 30G you probably needs lot of it.
Whatever you decide, make sure you install OFA compliant, avoiding installing different versionf of the sw. You will at least save something on memory then.

Hth,

Sybrand Bakker, Oracle DBA, established 1989.

On Wed, 24 Feb 1999 11:57:38 +0100, Jordi Ruana <ruana.j_at_ati.es> wrote:

>Hello everybody,
>
>I'm a unexperienced and just started DBA
>
>I'm changing our Unix infrastructure servers (Alphaserver 1000 and
>RS6000) in order to be able to run five Oracle instances in only a unix
>Server box. The instances aren't too big (maximum 30 GB the big one).
>The number of users is about 2-3 at max doing queries with Oracle
>Discover. There isn't OLTP.
>
>The Question is: could be that I'm doing crazy things or perhaps
>somebody has any experience on this one?. Also I'm trying to size the
>right machine (Digital or HP)
>
>Thanks in advance
>
>Jordi Ruana

Sybrand Bakker, Oracle DBA Received on Wed Feb 24 1999 - 06:25:50 CST