The Middleware Add-On is an option that allows Big Business to synchronize data with an external data source (MySQL) where it can be more readily accessed, repurposed, and manipulated. This Solution describes its connection settings (6172).
Connection Settings for the Middleware Add-On include:
Host - enter "localhost" or an IP Address
User - enter a user name with adequate privileges
Password - enter the user's password
Database - enter the name of the database you want populated
Port (optional) - leave blank for default (3306) or enter 8889 for MAMP
Socket - using "localhost" which is faster may require specifiying the Socket file for different distributions such as OS X Server or MAMP.