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while (my $row = $sth->fetch_arrayref()) {
   ...
}

my $rows = $sth->fetchall_arrayref();
my $num_rows = @$rows;
foreach my $row (@$rows) {
   ...
}

my $rows = $sth->fetchall_arrayref();
my $num_rows = @$rows;
...
while (my $row = $sponge_sth->fetch_arrayref()) {
   ...
}