The difference between BC and DBC is the method-call overhead. If you really want to squeze out nonoseconds per call, it matters. It is not something I would propagate in use though:

 Create table 5000 x 12
Dbindcol     660153.156  recs/sec    4.8 x faster  DBC
bindcol      633472.697  recs/sec    4.6 x faster  BC
Darrayref    563380.282  recs/sec    4.1 x faster  DAR
arrayref     525486.075  recs/sec    3.8 x faster  AR
array        227086.929  recs/sec    1.7 x faster  A
hashref      136836.344  recs/sec                  HR

[download]
    {   $sth->execute;
        my ($n, $now) = (0, [ gettimeofday ]);
        while (my $ref = $sth->fetchrow_hashref) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("hashref", $n, $now);
        }

    {   $sth->execute;
        my ($n, $now) = (0, [ gettimeofday ]);
        while (my @row = $sth->fetchrow_array) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("array", $n, $now);
        }

    {   $sth->execute;
        my ($n, $now) = (0, [ gettimeofday ]);
        while (my $ref = $sth->fetchrow_arrayref) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("arrayref", $n, $now);
        }

    {   $sth->execute;
        my ($n, $now) = (0, [ gettimeofday ]);
        while (my $ref = DBI::st::fetchrow_arrayref ($sth)) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("Darrayref", $n, $now);
        }

    my %ref;
    {   $sth->execute;
        $sth->bind_columns (\(@ref{@{$sth->{NAME_lc}}}));
        my ($n, $now) = (0, [ gettimeofday ]);
        while ($sth->fetch) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("bindcol", $n, $now);
        }

    {   $sth->execute;
        $sth->bind_columns (\(@ref{@{$sth->{NAME_lc}}}));
        my ($n, $now) = (0, [ gettimeofday ]);
        while (DBI::st::fetchrow_arrayref ($sth)) {
            ++$n % 100 == 0 and printf " %6d\r", $n;
            }
        report ("Dbindcol", $n, $now);
        }

[download]

Enjoy, Have FUN! H.Merijn

In reply to Re^4: DBI Style Inquiry by Tux
in thread DBI Style Inquiry by edict

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