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Jeez. Please do not mention client-library-managed transactions and then put "real" transactions in scare quotes. At least read the Wikipedia article first.

I just wanted to distinguish between the two. I wasn't scared in any way but read up on scare quotes now - so thanks for that. http://en.wikipedia.org/wiki/Scare_quotes

I didn't read it like that at all, I interpreted it as the gp distinguishing between the two.

If another host connects to the db, and the transaction doesn't span to that second host. Its not as safe as sql transactions.

The transaction does span across hosts with the linked package.

There are further details about how it works in this blog post:

http://blog.labix.org/2012/08/22/multi-doc-transactions-for-...

While it does work, it's still a workaround for the lack of first-class transactions in MongoDB. It offers a more limited API and requires care on the developer side.

Despite being the author, I do hope it gets obsoleted by more convenient first-class transaction support in MongoDB itself at some point in the near future.