There is a similar, reasonable answer on StackOverflow relating to Postgres parallel access via python.

You can't sanely share a DB connection across processes like that. You can sort-of share a connection between threads, but only if you make sure the connection is only used by one thread at a time. That won't work between processes because there's client-side state for the connection stored in the client's address space.

                "The difficult we do today; the impossible takes a little longer."

In reply to Re: Can't get multiple Parallel::ForkManager threads connecting to DBD::Pg database by NetWallah
in thread Can't get multiple Parallel::ForkManager threads connecting to DBD::Pg database by perlygapes

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