http://social.technet.microsoft.com/Forums/en-US/sharepointitpropreview

Do all Service application in SharePoint 2013 has its own content database?
I am working on Migration Project Moss 2007 to SP2013 there are various Service application
and few of the service have their own content database created at the backend.
Like User Profile,BDC,App Management Service,Search Service Application

But Security Token Service Application  ,Access Services do not have content databases.

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Mukund_SP2010