Topic Status: Some information in this topic is preview and subject to change in future releases. Preview information describes new features or changes to existing features in Microsoft SQL Server 2016 Community Technology Preview 2 (CTP2).
Total number of extents = EXTENTS, used pages = USED_PAGES, reserved pages = RESERVED_PAGES in this database.
This information is part of the output from the DBCC CHECKALLOC command. This information is the summary of allocated extents, used pages, and reserved pages for the specified database.