web.py update 5 - DbUtils pooling and apache MPM module

My application using web.py is still growing. One day happened something suprising. After testing on internal WSGI server, I deployed application at testing machine with Apache, and started checking. Login screen appeared and everything was looking ok. But after login I waited very long time and nothing happened. After couple of minutes (long timeout?) application finished request with exception inside DBUtils code. I've checked logs, another browser- still the same.

I googled exception code and found that it's something related with exhausted connection pool. Application grows and communication with database complicates too. I've add additional code closing connections. Still nothing.
Then I have found some interesting posts about DBUtils connection pooling method and problem related to apache MPM module.

Apache MPM modules are directly handling HTTP requests. DBUtils creates pool for application process. My default Apache configuration was MPM prefork. That means every http request is handled by one single threaded MPM process. DBUtils created pool for every apache handler process- that exhausted database connections.

There is simple solution if you use dedicated apache server- using MPM worker that works better with DBUtils multi threaded pooling.
Once again, the day was saved.