Path: utzoo!utgpu!attcan!uunet!husc6!think!ames!amdcad!weitek!pyramid!bejc
From: bejc@pyrnova (Brian Clark)
Newsgroups: comp.databases
Subject: Re: OLTP, New releases of Oracle and Rdb ...
Keywords: OLTP, performance
Message-ID: <34693@pyramid.pyramid.com>
Date: 8 Aug 88 23:33:45 GMT
Sender: daemon@pyramid.pyramid.com
Reply-To: bejc@pyrnova.UUCP (Brian Clark)
Organization: Pyramid Technology Corp., Mountain View, CA
Lines: 24

In article <1156@anasaz.UUCP> john@anasaz.UUCP (John Moore) writes:
>It appears that PERFORMANCE is on everyone's list (ORACLE, INFORMIX,
>INGRESS, UNIFY, SYBASE). AVAILABILITY is NOT! Some RDBMS's require
>that the system be shut down to take backups. None that I am aware
>of directly provide disk mirroring. PREDICTABILITY has not even

I am a little concerned at posting this here for fear of being flamed
for making a product announcement, but...

I would refer you to the paper
 Virtual Disks - A New Means of Unix Disk Configuration
 Tom van Baak & Brian Clark, Pyramid Technology
 Proceedings of the German Unix User Group conference, September 1987.

This describes the implementation of mirrorred disks, and three other
disk models within the Unix file system environment. All of the models
are pertinent to the database environment, and reflect the way in
which systems vendors are reacting to concerns other than PERFORMANCE
Virtual disks have been around for about 18 months now, and I'd be
happy to tell you all about them by mail.

Brian E.J. Clark
Pyramid Technology Corp
bejc@pyramid