incubator-couchdb-user mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From Jan Lehnardt <...@apache.org>
Subject Re: Should I use CouchDb?
Date Sat, 12 Dec 2009 19:06:26 GMT
Hi Markus,

that's good advice, thanks. And thanks for the plug :)

Cheers
Jan
--

On 10 Dec 2009, at 14:11, Markus Jelsma wrote:

> You should read throug the entire book but your questions are mostly
> answered in these chapters:
> - http://books.couchdb.org/relax/intro/eventual-consistency
> - http://books.couchdb.org/relax/reference/replication
> - http://books.couchdb.org/relax/reference/conflict-management
> 
> To summarize; CouchDB utilizes a non-locking multi version concurrency
> controler (MVCC) to allow for disconnected instances to CRUD the
> documents, which results in eventual consistency.
> 
> There exists no concept of locking but CouchDB's versioning system allows
> for handing document conflicts. These conflicts can and will rise in
> single but also multiple disconnected instances. In single instances the
> developer must provide the end-user with a mechanism to handle document
> conflicts or automate the process. During replication, CouchDB uses an
> arbitrary algorithm which choses a winner for conflicts.
> 
> CouchDB's conflict handling and versioning may be explained as somewhat
> similar to subversion and friends.
> 
> Although you may be very enthusiastic, you must read the book and forge
> some experiments for your use-case before actually going for it. There may
> be pitfalls.
> 
> In any case, the wiki's and this list will be helpful during your
> development.
> 
> 
> 
> 
> Leonardo M. Ramé wrote:
>> 
>> Knowing this, I seems that CouchDb is the way to go. In my model, each
>> health organization have a database server that must replicate its data
>> in planned intervals, twice a day for example.
>> 
>> This raises a question. Does the Replicator sends the whole database
>> from one server to another then do a diff between them?, or it has a
>> more lightweight approach?.
>> 
>> --
>> Leonardo M. Ramé
>> http://leonardorame.blogspot.com
> 
> 
> 


Mime
View raw message