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NoSQL databases opt not to offer important abstractions traditionally found in relational databases in order to achieve high levels of scalability and availability: transactional guarantees and strong data consistency. In this work we propose pH1, a generic middleware layer over NoSQL databases that offers transactional guarantees with Snapshot Isolation. This is achieved in a non-intrusive manner, requiring no modifications to servers and no native support for multiple versions. Instead, thedoi:10.1109/srds.2014.23 dblp:conf/srds/CoelhoCVPO14 fatcat:kochkj2ncradxndp2frkkwul64