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If I remember correctly, Mongo batches up writes to disk, and if something goes wrong before that happens, you could lose data. Master/slave setup stuff is the prevention tool of choice.

But I'm not 100% sure. Can anyone more familiar with Mongo internals confirm?

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MongoDB does not currently have single-server durability, so a crash can cause loss of data. As you point out, replication is the recommended path to durability. We'll also probably be adding support for single-server durability by 1.8.

That said, the article seems to imply "missing documents" with no crash. That is something I've never seen reported before this post.

Awesome, thanks.

I'm actually in the opposite boat that the author is; I'm trying to find a good excuse to start using Mongo. I need to get better at modeling data without schemas... I don't feel comfortable using it until I get better at the design aspect.

Have you checked out this page: http://www.mongodb.org/display/DOCS/Schema+Design

I think there are also some videos linked from there that should help.

I have not, thanks! I've asked about this topic a few times, and never got a good response. It's not like I was trying hard, though.

Bookmarked. I can't wait to dig into this. Thanks again.

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