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It's pretty poor right now:
http://pjcj.sytes.net/cover/latest/DBI-1.52/coverage.html
Start with improving the subroutine coverage
http://pjcj.sytes.net/cover/latest/DBI-1.52/blib-lib-DBI-pm--subroutine.html
Ideally the proxy should be tested in the same way as DBI::PurePerl. In other words, by creating wrappers test files for each test file that set $ENV{DBI_AUTOPROXY} and run the original test. They'll also need to start and stop a proxy server.
http://rt.cpan.org/NoAuth/Bugs.html?Dist=DBI
Naturally I'll offer direction and guidance on any you want to tackle. I've also got a few that could be entered into rt.cpan.org.
Protect trace_msg from SIGPIPE? prepare(...,{ Err=>\my $isolated_err, ...}) Add trace module that just records the last N trace messages into an array and prepends them to any error message to provide context for the error. Document DBI_PROFILE_FLOCK and LockFile attrib in DBI::ProfileData and DBI::ProfileDumper
Performance:
Move _new_sth to DBI::db::_new_sth (leave alias) and implement in C Or call _new_child and move to DBI::common? Implement FETCH_many() in C Add high-res dbi_time for windows - via Time::HiRes glob replace dbi_time()?