What is this "other conception of concurrency" you're referring to? BerkeleyDB allows either database level or page level locks. Page level locks are trickier, since you have to run the deadlock daemon. Database level locks are trivial and require no special knowledge, and perform well.

I don't understand your shared memory comment. MySQL is implemented as multiple threads which share memory, but they don't share memory with your program. BerkeleyDB does use a shared memory cache, and it runs resident in your process, so you are accessing data directly from shared memory, unlike MySQL where you access it over a socket.

In reply to Re^3: Perl Hash vs BerkeleyDB vs MySQL by perrin
in thread Perl's Hash vs BerkeleyDB vs MySQL by monkfan

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