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Here's a brief overview comparison of DynamoDB vs. BigTable:


The site is also able to compare many other different databases.

It seems as if this site is a user-edited wiki, and there are a lot of things that need to be filled in (in case anybody is up to speed on DynamoDB and wants to help). For instance, the Map/Reduce entry was still '?' when I wrote this.


And Big Table (or at least GAE) does support transactions.


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