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Cool Haircuts For Girls WithChrisAAug 7, 06:43 PMProbably the same way it is in scalable transactional databases that use multi-versioning concurrency protocols (e.g. PostgreSQL and Oracle). No data is over-written, and every "update" actually creates a new record version. Lots of ways it COULD be implemented. Looks at Suns new file system ZFS. It is basically "Copy on Write". With a file