What's the difference?
l while(@row = $sth->fetchrow_array) {  }
n one field:   3100 fetches per cpu second
n ten fields:  1000 fetches per cpu second
l while($row = $sth->fetchrow_arrayref) {  }
n one field:   5300 fetches per cpu second
n ten fields:  4000 fetches per cpu second
l Notes:
n Timings made on an old Sparc 10 using DBD::Oracle.
n Timings assume instant record fetch within driver.
n Fields all one char. @row would be even slower for more/bigger fields.
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