I am facing a similar issue with Oracle database. Tim's slides doesn’t explain details of implementation. I have Apache httpd with mod_perl and DBI. Without many code changes, what does the proxy server look like to achieve the database connection pooling?
What is "Apache running DBI Gofer" as shown in the slides page 26?
There is nothing exactly like the database pool in JDBC. However, there are solutions for this problem.
Note that there are many lightweight proxy servers now that can act as a front-end for mod_perl, not just Apache httpd.
Tim's slides explaining how this was used in a real-world scenario are here: