in reply to Re^3: If I am tied to a db and I join a thread, program chrashes
in thread If I am tied to a db and I join a thread, program chrashes

If your question is about DBI, read the discussion of Threads and Thread Safety. If it's not about DBI, it's even less clear to me about what your question is. But in general, you will have much more luck in launching separate programs instead of trying to use fork() or threads to run DBI things in parallel.

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