$ perl test.pl
plain duration : 0.639 secs
plain lookups  : 10243321 / sec
  cdb duration : 5.692 secs
  cdb lookups  : 1150711 / sec
   db duration : 9.746 secs
   db lookups  : 672046 / sec

$ /opt/perl-5.26.0/bin/perl test.pl
plain duration : 0.517 secs
plain lookups  : 12677776 / sec
  cdb duration : 3.881 secs
  cdb lookups  : 1687545 / sec
   db duration : 6.134 secs
   db lookups  : 1067780 / sec
  sql duration : 184.338 secs
  sql lookups  : 35532 / sec