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All the Perl that's Practical to Extract and Report

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  • have been wrestling with these sort of concurrency issues for decades now (and of course you can view the DB as a set of assertions). With something like mvcc you're not even dealing with a single timeline any more.

    • http://www.postgresql.org/docs/8.3/static/mvcc.html
    • http://wiki.postgresql.org/wiki/MVCC
    • http://www.postgresql.org/docs/8.3/static/transaction-iso.html

    There's been a recent discussion on the pgsql-hackers list wrt some issues of implementing true serializable transactions that might feed in to what you're interested in.

    And of course, if you find a simple, efficient, easily understandable implementation then don't forget us little people once you get your Nobel :-)