Space Allocation Structures
When a table or index needs more space in a database, SQL Server needs a way to determine where space is available in the database to be allocated. If the table or index is still fewer than eight pages in size, SQL Server must find a mixed extent with one or more pages available that can be allocated. If the table or index is eight pages or larger in size, SQL Server must find a free uniform extent that can be allocated to the table or index.
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