Generally Segmentation fault happens when executes some buggy C or XC code.
Try to use CoreDumpDirectory directive in your httpd.conf file: 
    CoreDumpDirectory /blah/blah/core

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for configure Apache to dump core file to a specific directory and then use a debugger to find out a C function which is causing the problem.
And maybe more efficient use Apache::DBI for access to a database (It's only my opinion. mod_perl include a lot of useful modules: Apache::File, Apache::DBI etc and if you use mod_perl I think will be better use Apache modules for good performance).
Good like! 
      
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SV* sv_bless(SV* sv, HV* stash);

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In reply to Re: DBI and CGI qw(-compile) order causes seg fault by nite_man
in thread DBI and CGI qw(-compile) order causes seg fault by UnderMine

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