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From Audrey Lee <>
Subject Re: Replicating a subset of data(data for user of a website)
Date Mon, 29 Mar 2010 15:42:01 GMT
At the risk of appearing lazy about RTFM, I'll add another question to
the thread.

If I have 1,000 users then my use-case would convince me to create a
couchDB database for each user.

So, if I have 1,000 couchDB databases installed on my server in the
datacenter, does that mean that I'd have 1,000 couchDB

Or could I configure couchDB on my server such that it is more like a
webserver (which might be only a few processes).

While waiting for a possible response to my question, I'll start
reading this book:

Perhaps the answer is in there.


On 3/28/10, Jan Lehnardt <> wrote:
> Hi Audrey,
> CouchDB is well suited for your needs :)
> There are two approaches you can take:
> 1) Create a database per user (or itinerary). That way,
> replicating a database will only include the data that's
> interesting to a single user. On the server side, you
> don't end up with a ginormous database that has all
> users' data mashed together.
> 2) If you like ginormous databases, you can use a new
> technique called "filtered replication" that lets you replicate
> only a subset to your users netbooks. It is described in more
> detail on the Couchio blog*. Note that this is only available
> in CouchDB 0.11.0 which is about to be released.
> *
> 3) Bonus version: For completeness sake, there is another
> possible approach that might work as a stop-gap but is not,
> I think feasible. You can define a document update validation
> function on your users' netbooks to block all writes that include
> data they are not interested in. If you replicate now, the netbook
> will only include the user's data, but for each client you will send
> all your data down and the client's CouchDB rejects the writes.
> Like I said, very likely not feasible in your case.
> I'd go with 1) if you don't need the big database and 2) if you do.
> Cheers
> Jan
> --
> On 28 Mar 2010, at 22:41, Audrey Lee wrote:
>> Hello List,
>> I'm starting work on a website for tourists.
>> The basic use-case is that a tourist uses the site to store and
>> retrieve information about itineraries.
>> In addition to the website I want to create a netbook application
>> which the tourist can use while she is disconnected from the web.
>> I want the netbook application-data-store to synchronize with the
>> data-store of the website.
>> The replication abilities of couchDB interest me.
>> I'm curious about some deployment issues.
>> How easy is it to implement couchDB such that all of the data for all
>> of the tourists is in a data-center?
>> Obviously I want each tourist to have a local copy of only her data.
>> Is it easy to deploy couchDB on each netbook so the netbook has only
>> data related to 1 user?
>> Based on the small amount of reading that I've done, I gather that it
>> is easy to replicate an entire couchDB between hosts.
>> For my use case, I dont want to replicate an entire couchDB from a
>> data-center to a netbook.
>> Instead I want to replicate a subset of a couchDB.
>> Has anyone on this list dealt with a use-case similar to my
>> tourist-site-and-app use-case?
>> --Audrey

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