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Re: What Instance means ?

From: John P. Higgins <jh33378_at_deere.com>
Date: Sat, 27 Feb 1999 18:48:04 -0600
Message-ID: <36D89243.B822B0F3@deere.com>


Since Oracle was the first commercial RDBMS, maybe all the others got it wrong?

Graham Miller wrote:

> Dictionary <no_at_email.edu> wrote (in <36D48FB7.EA86F023_at_email.edu>)...
>
> | "Instance" means "Server" almost every time you see it.
> |
> | The word "instance" came into use because of it's more precise meaning:
> | a specific collection of processes acting like a single server. Hence a
> | "Parallel Server" has more than one "instance", each instance acting
> | independently, but cooperatively on more than one system.
> |
> | Hope that helps,
> | Ryan :)
>
> And running two completely separate Oracle 'instances' (one
> development' and one live) on one physical 'hardware server' is?
>
> Also, there is a 'Parallel Server' Oracle accessing many 'instances'
> on different 'hardware servers'.
>
> I think that an Oracle 'instance' as being the processes and data
> files on a physical server is the most appropriate way to think about
> it. Obviously, there can be many 'Oracle instances' on any 'hardware'
> server.
>
> I agree it gets confusing when trying to map it to other manufacturers
> idea of a 'database'. Normally that maps onto an Oracle 'schema'
> quite well. Yes, it is not an exact mapping (to put it mildly)!
>
> graham
Received on Sat Feb 27 1999 - 18:48:04 CST

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