If I recall, the POD for DBD::SQLite lists resources for additional reading specific to the SQLite database. SQLite isn't Perl-only. It just happens that someone's gone to the work of creating a Perl module that enwraps SQLite. That means there is more support out there for SQLite than if it were a Perl-only entity. When I was looking into it a year or so ago I'm fairly certain that the module's POD points you toward the SQLite-specific documentation.