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From the VoltDB FAQ (http://community.voltdb.com/faq#id545596):

Key-Value stores are a mechanism for storing arbitrary data (i.e. values) based on individual keys. Distributing Key-Value stores is simple, since there is only one key. However, there is no structure within the data store and no transactional reliability provided by the system.

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Sorry. I didn't write it and I'll see what I can do about toning down the language. In the defense of the text, while some Key-Value stores provide atomic operations on individual values, I'm not aware of many that offer actual transactions in the traditional sense of the term.

If you want to complain about our marketing, feel free to email Fred Holahan (fholahan at voltdb.com). He didn't write everything on our website, but he's in charge.

I hadn't really looked into Scalaris much. I see they're trying to provide transactions on a DHT. Cool. Something to keep an eye on.

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