SQL Server Max Degree of Parallelism value for AX2012R3

Hi Friends,

as per the below link 

http://dynamicsaxtopics.blogspot.com/2013/09/top-10-issues-discovered-from-microsoft.html

it's says in Value for Max Degree of Parallelism value should set to one .

refer below link for more information,

http://blogs.msdn.com/b/axinthefield/archive/2013/06/18/top-10-issues-discovered-from-premier-field-engineer-dynamics-ax-health-check.aspx?CommentPosted=true#commentmessage

But i wanted to know if we keep default value (default value is 0 in my case) what will be the issue , 
as example will it cause to unexpected growth of the Database or will it cause to Performance issues , or is there any other impact of this ?

thanks in advance,

Amith Prasanna