in reply to Creating members of hash of hashes parallelly

You don't want a hash in that middle level, then, you want an array: $db_hash{$path}[$idx]{$key}. To do that, you'd do:
while (<>) { my ($path, $start, $end, $delay) = split; # or however you get them push @{ $db_hash{$path} }, { START => $start, END => $end, DELAY => $delay, }; }

Jeff japhy Pinyan, P.L., P.M., P.O.D, X.S.: Perl, regex, and perl hacker
How can we ever be the sold short or the cheated, we who for every service have long ago been overpaid? ~~ Meister Eckhart