***SPAM*** Definition of data consistency
Jem queried our definition of data consistency, which is currently: A policy that specifies or describes how up-to-date an instance of data is in one service of a distributed system, with respect to one or more instances of that data elsewhere in the system. Jem said (in e-mail): my thought was that data consistency would be a state of the data - it's consistent w.r.t. some other set of data or it isn't; the policy would be the rules that determine whether it is, and what the requirements are. I've had a look through our document and I agree. We refer to data consistency policies but also to data consistency requirements, mechanisms and strategies. So, how about this as a revised definntion: "A measure of how up-to-date an instance of data is in one service of a distributed system, with respect to one or more instances of that data elsewhere in the system." Best wishes, Dave Berry Deputy Director, Research & E-infrastructure Development National e-Science Centre 15 South College Street, Edinburgh, EH8 9AA +44 131 651 4039 www.nesc.ac.uk http://www.nesc.ac.uk/
Dave,
I think that I am okay with that suggested change. I am a little bit
worried about using the word "measure" as it can be taken to imply things
that we really do not want to address (e.g., a means to measure and a
quantifiable scale for measurement). I thought about suggesting changing
"A measure" to "An indication" but that seems just a bit too vague to me.
I don't have a better suggestion right now.
Allen Luniewski
IBM Cross Brand Services
IBM Silicon Valley Laboratory
555 Bailey Ave.
San Jose, CA 95141
408-463-2255
408-930-1844 (mobile)
"Dave Berry"
participants (2)
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Allen Luniewski
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Dave Berry