You can use the perldoc command to get more information about
DBI.
perldoc DBI
perldoc DBI::FAQ
perldoc DBD::mysql
You can also use the pod2man, pod2html, etc., tools to
translate to other formats.
And of course you can find the latest DBI information at
the DBI web page:
http://www.symbolstone.org/technology/perl/DBI/index.html