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People scream ACiD on NoSQL's because they fail the easier A, C, or D in various forms, not the harder I part. Having AC&D go a long way in ensuring data corre
by ww520 14y ago
People scream ACiD on NoSQL's because they fail the easier A, C, or D in various forms, not the harder I part. Having AC&D go a long way in ensuring data correctness.
- pbailis 14y agoUnlike "C" and "A" in "CAP," "AC&D" (specifically, "C") can't be easily separated from "I". Serializability ("I") ensures that database consistency, or maintenance of integrity constraints ("C"), is not violated. While it's possible to get consistency ("C") without serializability (which would give up traditional "I" in favor of a weaker form of isolation), it's often difficult [see http://www.bailis.org/blog/when-is-acid-acid-rarely/#arbitrary-note http://www.bailis.org/blog/when-is-acid-acid-rarely/#arbitra...].
- lucian1900 14y agoThings like MongoDB fail at A and D, which is what the parent was probably thinking of.
- willlll 14y agoIt also fails at C for concurrent writes
- lucian1900 14y agoSure, but A and D are the particularly embarrassing ones.