i think you'll get answer from monks with great psql experience, but reading here and there i can guess it is not a Perl issue but a warning (yes just an annoying one) caused (if i understand correctly) by the driver: the transaction is already started and psql give back this warning (for you safety)
L*
In reply to Re: How to remove the warning: "there is already a transaction in progress" when using lock table
by Discipulus
in thread How to remove the warning: "there is already a transaction in progress" when using lock table
by angeloulivieri
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