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An extent is a collection of eight physically contiguous pages. The size of each extent is 64 KiB. There are two types of extents: Uniform extents are owned by a single object, for example a single table; all eight pages in the extent can only be used by the owning object. Mixed extents are shared by up to eight objects. Each of the eight pages in the extent can be owned by a different object. Up to, and including, SQL Server 2014 (12.x), the Database Engine doesn’t allocate uniform extents to tables with small amounts of data. A new heap or index allocates pages from mixed extents. When the heap or index grows to the point that it uses eight pages, it then switches to uniform extents for all subsequent allocations. Starting with SQL Server 2016 (13.x), the Database Engine uses uniform extents for allocations in a user database and in tempdb, except for allocations belonging to the first eight pages of an IAM chain. Allocations in the master, msdb, and model databases still retain the previous behavior. Up to and including SQL Server 2014 (12.x), you can use trace flag (TF) 1118 to change the default allocation to always use uniform extents. For more information about this trace flag, see trace flag 1118. Starting with SQL Server 2016 (13.x), TF 1118 has no effect. The functionality provided by TF 1118 earlier is automatically enabled for all user databases and for tempdb. For user databases, this behavior can be controlled by the MIXED_PAGE_ALLOCATION database option. The default value is OFF, which means that uniform extents are used. For more information, see ALTER DATABASE SET options. Starting with SQL Server 2012 (11.x), the sys.dm_db_database_page_allocations system function can report page allocation information for a database, table, index, and partition. Important: The sys.dm_db_database_page_allocations system function isn’t supported and is subject to change. Compatibility isn’t guaranteed. This view isn’t available in Azure SQL Database. An IAM page has a header that indicates the starting extent of the range of extents mapped by that page. An IAM page also has a bitmap in which each bit represents one extent. The first bit in the map represents the first extent in the range, the second bit represents the second extent, and so on. If a bit is 0, the extent it represents isn’t allocated to the allocation unit owning the IAM page. If the bit is 1, the extent it represents is allocated to the allocation unit owning the IAM page.