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From Chris Anderson <jch...@apache.org>
Subject Re: Temporal data
Date Sun, 08 Mar 2009 03:30:06 GMT
On Sat, Mar 7, 2009 at 7:22 PM, Ben Hood <0x6e6562@gmail.com> wrote:

> 2. Implement some kind of version control as part of the document metadata;

CouchDB does not do document versioning. Because of it's append-only
files, the storage model will allow access to snapshots of the
database at each seq num. The file driver needs a little work to close
the gap, but once the code is written, you'll be able to roll back to
point in time snapshots of the database (as long as you don't compact,
which means storage is unbounded.)

This is really only useful for the Durability in ACID. It means that
if the file is truncated, it still contains a valid state.

>
> Has anybody had any experience with this all?
>

The solution is to store each document version as a different CouchDB
document. Jan is building an example wiki these days.

Chris

-- 
Chris Anderson
http://jchris.mfdz.com

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