Path: utzoo!attcan!uunet!tut.cis.ohio-state.edu!pt.cs.cmu.edu!rochester!newkodak!newkodak.uucp!deal
From: deal@newkodak.uucp (Stephen M. Deal)
Newsgroups: comp.databases
Subject: Multiple DBMS servers on the same CPU
Message-ID: <1990Jun12.154120.3169@newkodak.kodak.com>
Date: 12 Jun 90 15:41:20 GMT
Sender: deal@newkodak.kodak.com (Stephen M. Deal)
Distribution: na
Organization: Eastman Kodak Co, Rochester, NY
Lines: 26


We are wondering what the impact on a hardware/os platform would be if we
ran two (or more) DBMS servers simultaneously on the same CPU. For example
if we use a vendors application which runs on the DBMS bundled with the OS
and then develop our own applications on a different DBMS, what would be
the performance impact.

It seems to me that the two DBMSs might fight for resources and therefore
provide less throughput than if both applications used the same DBMS.
However this is the real (read heterogeneous) world and quite often we are
faced with applications that are not DBMS independent. 

Aside from the obvious problems of sharing data between the databases (RDA
ain't here yet), does anyone have experience running two RDBMSs simultaneously
on the same CPU (e.g. Ingres and Rdb/VMS, Informix and Sybase)?

Thanks,
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