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Data look-up on the Web
In a large, distributed, and heterogeneous environment, classical ACID guarantees of the database world no longer scale in any sense.
Even a simple read operation in an environment such as the Web, a peer-to-peer storage network, a set of distributed repositories, or a space, cannot guarantee completeness in the sense of assuming that if data was not returned, then it was not there.
Similarly, a write can also not guarantee a consistent state that it is immediately replicated to all the storage facilities at once.