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From Mage <m...@mage.hu>
Subject Re: CouchDB's advantages over MongoDB
Date Fri, 15 Apr 2011 14:37:04 GMT
On 04/14/2011 03:47 PM, Daniel ItaboraĆ­ wrote:
>    -
>
>    Crash Proof durability (not having to replicate to achieve durability as
>    a best practice)
MongoDB will not become crash-proof just by migration. If your cluster
goes down together, for example by power failure in the datacenter, you
can end up all your nodes corrupted.

Since v1.7.5 it can be run with journaling, however you should read this
page before you decide:

http://www.mongodb.org/display/DOCS/Journaling


            "Can I use the journaling feature to perform safe hot backups?

Not yet, as the journal files are rotated out (unlinked) after data is
safely in the data files."


"MongoDB may determine that it is faster to preallocate journal files
than to create them as needed. If MongoDB decides to preallocate the
files, it will not start listening on port 27017 until this process
completes, which can take a few minutes. This means that your
applications and the shell will not be able to connect to the database
immediately on initial startup."

        Mage




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