Path: utzoo!attcan!uunet!wuarchive!zaphod.mps.ohio-state.edu!sdd.hp.com!hplabs!hpda!hpcuhc!dhepner
From: dhepner@hpcuhc.HP.COM (Dan Hepner)
Newsgroups: comp.databases
Subject: Fault Tolerance
Message-ID: <2060004@hpcuhc.HP.COM>
Date: 2 Aug 90 19:41:07 GMT
Organization: Hewlett Packard, Cupertino
Lines: 31

From: endrizzi@sctc.com (Michael Endrizzi )

>And the war starts.....

Oh, I didn't have in mind any war, and I'll certainly accept
that one is free to assert one's own definition of words
like "fault tolerant".

>Fault Tolerance: A list of faults that will be tolerated and the 
>post-fault level of service for each fault. The process of tolerating
>a fault consists of 3 steps: fault detection, isolation, and recovery.

>Fault Tolerant Information Recall:
>
>	1) Tolerates syntatic faults in databases
>	2) Post level of service guarantees data that is
>	   syntatically "closest" to query.
>	3) Fault-Detection: implicit and assumed
>	   Fault-Isolation: ???
>	   Fault-Recovery:  Query always returns with "best" answer 
>		            available.
>
>Can I see your definition of fault-tolerance mr. hepner??
>Then we can talk.
>
>				Dreez

A widely accepted definition of fault tolerance concerns the ability
to continue to provide service in the face of various hardware faults.

Dan Hepner