The following tables specify the maximum sizes and numbers of various objects defined in SQL Server 2012 components, and compared against the maximum sizes and number of various objects defined in SQL Server 2008 and SQL Server 2008 R2 components.
Instances per computer 50 instances on a stand-alone server for all SQL Server editions. 50 instances on a stand-alone server for all SQL Server editions. 50 instances on a stand-alone server for all SQL Server editions.
Triggers per table Limited by number of objects in a database. Limited by number of objects in a database. Limited by number of objects in a database.
Objects per DAC Limited by the number of objects in a database, or available memory. Limited by the number of objects in a database, or available memory. Limited by the number of objects in a database, or available memory.