A problem that has plagued SQL Server for a long time is that a database is not very portable. Sure, you can backup or detach a database and restore or attach it elsewhere, but when you do that, you are missing a lot of the pieces that make that database a part of an application, and a lot of those pieces are really considered administration pieces as opposed to application pieces. You don’t get any synchronization of “outside of the database” items such as security, roles, linked servers, CLR, database mail, service broker objects, replication, and SQL Server Agent jobs.
In SQL Server 2012, some of these issues are being addressed with a feature called “contained databases.” A contained database is a concept in which a database includes all the settings and metadata required to define the database and has no configuration dependencies on the instance of the SQL Server Database Engine where the database is installed. Users connect to the database without authenticating a login at the Database Engine level. Isolating the database from the Database Engine makes it possible to easily move the database to another instance of SQL Server. Including all the database settings in the database enables database owners to manage all the configuration settings for the database.
SQL Server 2012 Release Candidate 0 (RC 0) includes a first step toward contained databases, introducing partially contained databases (also known as Partial-CDB). Partially Contained Databases provide some isolation from the instance of SQL Server but do not yet provide full containment.
In SQL Server 2012, the first iteration of the contained databases feature will provide the following solutions:
Note in a partially contained database you cannot use replication, change data capture, or change tracking.
Expect Microsoft to move toward have true fully contained databases in future versions of SQL Server.
Contained Databases in SQL Server 2012
Step-by-Step guide to Implement Contained Databases
SQL Server v.Next (Denali) : Contained Databases
CONTAINED DATABASE – SQL SERVER 2012
Video SQL Server Code Named “Denali” Contained Database Authentication Demo
What is Contained Database in SQL Server
SQL Server 2012 – New Features – Contained Databases
SQL Server 2012: Sometimes Partial Is Preferable
Contained Database Authentication in SQL Server 2012