Make sure that you have the current version 0.93 of DBI::BabyConnect and
Apache::BabyConnect. Prior versions to 0.93 will not work.

From CPAN download and install DBI::BabyConnect.
Follow the instructions on how to test the DBI::BabyConnect.

From CPAN download and install Apache::BabyConnect.
Let's assume you have extracted the Apache-BabyConnect-0.93.tar.gz into /opt.

Locate the babystartup.pl in the directory
The directory /opt/Apache-BabyConnect-0.93/startupscripts


The directory /opt/Apache-BabyConnect-0.93/eg/perl contains the
perl test scripts for Apache::BabyConnect.
If you have configured mod_perl to serve from /var/www/perl, then
copy the test scripts from eg/perl to /var/www/perl,


1- Edit the file babystartup.pl and make the appropriate changes
 if necessary.

-----------------------------------

2- Edit /etc/httpd/conf.d/perl.conf and add the code to set the
  BABYCONNECT environment variable and to the babystartup.pl before
  anything else. For instance a typical perl.conf will have the
  following code.

PerlSetupEnv Off
PerlSetEnv BABYCONNECT /opt/DBI-BabyConnect/configuration
PerlRequire /opt/Apache-BabyConnect-0.93/startupscripts/babystartup.pl

Alias /perl /var/www/perl
<Directory /var/www/perl>
    SetHandler perl-script
    PerlResponseHandler ModPerl::Registry
    PerlOptions +ParseHeaders
    Options +ExecCGI
</Directory>



WARNING: you do not need to load Apache::DBI, refer to the man
  page of Apache::BabyConnect for information on the caching mechanism
  of Apache::BabyConnect module.
 

-----------------------------------

3- Restart httpd

You can tail the httpd error_log file to view the initialization
of the connection as the httpd servers start up. Each server
will be started with 4 database descriptors, therefore each server
will have 4 active DBI::BabyConnect objects that will server
4 data sources. While a descriptor is uniquely identified by its
name, two or more descriptors can point to the same data source. The
sample scripts delivered with the distribution use all database
descriptors that point to the same data source.

4- Make sure that you have copied the test scripts from
   /opt/Apache-BabyConnect-0.93/eg/perl/ to /var/www/perl
   and you have set their permission to executable (chmod 755 /var/www/perl/*.pl)

  Test your connection from a browser:
    http://yourserver.com/perl/testbaby.pl

5- Test the caching:
    http://yourserver.com/perl/testcache.pl
Keep on requesting testcache.pl for couple of time and observe
the counter of the cached database descriptor increasing.

   Request http://yourserver.com/perl/testbaby.pl
This should display the cached database descriptor as well.
Both testbaby.pl and testcache.pl are using the DBI::BabyConnect
that have been cached by the babystartup.pl script.

6- Test caching a new DBI::BabyConnect object with a different database descriptor.
   Issue the following request just once:
     http://yourserver.com/perl/onemore.pl
   Now issue the following request couple of time:
     http://yourserver.com/perl/testcache.pl

   You should notice that only one of the http server has the cached database
   descriptor.
   You can place another request to
     http://yourserver.com/perl/onemore.pl
   If the http server serving your request has the database descriptor cached, then
   the cached DBI::BabyConnect object is used and its counter is increased. Otherwise, the
   http server will load that new DBI::BabyConnect object and cache it.

   In a random situation where DBI::BabyConnect objects are requested, if you have 4 database
   descriptors to be used, and 8 http servers started, then you end up having each of the
   http server caching 4 database descriptors.
   Two http servers will never share the same DBI::BabyConnect objects.
   If you are reading data from the data sources, then you are doing fine. But if you
   are writing to the database, then you need to know what you are doing.

7- Test the rollback
In globalconf.pl set 
ON_FAILED_DBIEXECUTE_ROLLBACK_AND_EXIT=1
and restart the httpd
this will rollback and exit on error. With Apache::BabyConnect the rollback
is effectively handled by DBI::BabyConnect, and the exit is handled by Apache
MD2. In other word your script will end at that point (after the rollback took
effect)
Test script: testrollback.pl
   Request http://yourserver.com/perl/testrollback.pl

In globalconf.pl set 
ON_FAILED_DBIEXECUTE_ROLLBACK_AND_EXIT=0
and restart the httpd (/etc/rc.d/init.d/httpd restart)
this will neither rollback nor exit on error. In addition
your script will continue past the point of the do()'s. You can
chose to rollback programmatically if you want.
Test script: testrollback.pl
   Request http://yourserver.com/perl/testrollback.pl