Database Pages
All information in SQL Server is stored at the page level. The page is the smallest level of I/O in SQL Server and is the fundamental storage unit. Pages contain the data itself or information about the physical layout of the data. The page size is the same for all page types: 8KB, or 8,192 bytes. The pages are arranged in two basic types of storage structures: linked data pages and index trees.
Databases are divided into logical 8KB pages. Within each file allocated to a database, the pages are numbered contiguously from 0 to n. The actual number of pages in the database file depends on the size of the file. Pages in a database are uniquely referenced by specifying the database ID, the file ID for the file the page resides in, ...
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