Do you have AutoCommit turned Off ?
Snippet that use COPY: 
my $table = 'table';
my @cols = (qw( a b c));
$" = ", ";
$dbh->do ("COPY $table (@cols) FROM STDIN");

while (...) {
  $dbh->pg_putline (join ("\t", @values) . "\n");
}
$dbh->pg_endcopy;
$dbh->commit;

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In reply to Re: Speeding up Postgres INSERTs by happy.barney
in thread Speeding up Postgres INSERTs by punkish

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