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tl;dr: NewSQL databases rarely provide true ACID guarantees by default

Peter Bailis is at it:

Many databases today differentiate themselves from their NoSQL counterparts by claiming to support “100% ACID” transactions or “guaranteeing strong consistency (ACID).” In reality, few of these databases—including traditional “big iron” systems like Oracle—provide formal ACID guarantees, even when they claim to do so.

via: http://www.bailis.org/blog/when-is-acid-acid-rarely/