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Date: Mon, 27 Jun 2011 11:04:28 +0200
Message-ID: <BANLkTik56z0cV1SJN2wdXg3Wqe=1xNbc-A@mail.gmail.com>
Subject: Re: CouchDB vs RavenDB (Specific features)
From: Marcello Nuccio <marcello.nuccio@gmail.com>
To: user@couchdb.apache.org
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2011/6/27 Ryan Zec <basire@gmail.com>:
> *Transactions
> *This is kind of important for me. =C2=A0An example would be sending scor=
es to
> the database. =C2=A0When someone sends a score to the database, first I a=
m going
> to store that score as its own entity. =C2=A0Then I am going to want to u=
pdate
> the record that stores the total for the day, week, month, etc... =C2=A0I=
f any
> one of these updates fail, I don't want to any of the updates to save
> (saving the insert is fine). =C2=A0Is there a way to do this for CouchDB?

I don't think you will need to store a record with the totals in CouchDB.
You should use a view for that.
http://wiki.apache.org/couchdb/Introduction_to_CouchDB_views


> *Writing To Disk
> *I really like that RavenDB by default writes to disk as it makes sure th=
at
> when data is sent to the server, the data will be there even if there is =
a
> power outage or some other event that happens that is out or your control=
.
> I would rather sacrifice a little write performance to maintain a much
> better chance that data is not lost. =C2=A0While that data I am storage i=
s not
> super mission critical (like payment information), it is still pretty
> important to the players of the game and important if we want the meta ga=
me
> to be successful. =C2=A0Can CouchDB configured to write to disk instead o=
f memory
> (or does it do that be default)?

You can turn off delayed commits for maximum safety, but make sure to
do some performance test.
You can read about delayed commits at
http://guide.couchdb.org/draft/performance.html#single


> *Auto Indexing
> *One thing that is really nice with RavenDB is that is has auto index whe=
re
> if you use an index that is not manually create a lot, RavenDB will
> automatically turn the temporary index into an real index for you. =C2=A0=
Can
> CouchDB do this?

In CouchDB you build an index by adding a view, i.e. a Map function
and, optionally, a Reduce function. So I don't think it is technically
possible to automatically build it.

...just my 2cents.

Marcello

PS: I have never used RavenDB so I do not know how does it compare to Couch=
DB.