The resource Database
The resource database contains all the system objects deployed with SQL Server 2014. These system objects include the system stored procedures and system views that logically appear in each database but are physically stored in the resource database. Microsoft moved all the system objects to the resource database to simplify the upgrade process. When a new release of the software is made available, upgrading the system objects is accomplished by simply copying the single resource database file to the local server. Similarly, rolling back an upgrade only requires overwriting the current version of the resource database with the older version.
You do not see the resource database in the list of system databases shown in SQL ...
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