Unit of Work is a great capability in Microsoft Dynamics AX 2012 to reduce chattiness between AOS and SQL server. A high level overview of UoW is available in this informative blog post: http://dynamics-ax.blogspot.com/2011/07/microsoft-dynamics-ax-2012-unitofwork.html.
One of the cool things about unit of work (UoW) is the capability to use a custom user connection. If you would like a set of DML operations to be executed on a separate user connection then that is possible with UoW. If you have legacy code that uses RecordInsertList and want to use a custom user connection then you should rewrite the code using UoW.
Here is an example of how to use UoW with a custom user connection:
static void UoWTest(Args _args)
// Define a new user connection
UserConnection uc= new UserConnection();
// Define a new UoW
unitOfWork uofw = new UnitofWork();
// Add a table buffer to insert on save changes in the UoW
table1.Field1 = 'foo';
// Perform additional interactions that you
// want to club together with the UoW
// by calling insertonSaveChanges, updateonSaveChanges
// and deleteonSaveChanges
// Finally pass the user connection to
//the UoW to use on SaveChanges