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: MVCC
:: Multiversion concurrency control (abbreviated MCC or MVCC), in the database field of computer science, is a concurrency control method commonly used by database management systems to provide concurrent access to the database and in programming languages to implement transactional memory.[http://en.wikipedia.org/wiki/Multiversion_concurrency_control]
: Binary vs Integer for primary key
:: [http://stackoverflow.com/questions/4037796/binary-vs-integer-as-primary-key]
===Persistence===
