http://www.perlmonks.org?node_id=11124837


in reply to Re^4: checking mysql rows continuously
in thread checking mysql rows continuously

The IBM db2 (which you're not using) docs are old. See https://metacpan.org/pod/distribution/DBI/Changes#Changes-in-DBI-0.83,-11th-June-1997, if you are going to use an undocumented method expect to have no support and to have to do some digging on your own.