October 2006
Intermediate to advanced
464 pages
16h 11m
English
Content preview from Inside Microsoft® SQL Server™ 2005, Fourth EditionBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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Databases Under the Hood
A database consists of user-defined space for the permanent storage of user objects such as tables and indexes. This space is allocated in one or more operating system files.
Databases are divided into logical pages (of 8 KB each), and within each file the pages are numbered contiguously from 0 to x, with the value x being defined by the size of the file. You can refer to any page by specifying a database ID, a file ID, and a page number. When you use the ALTER DATABASE command to enlarge a file, the new space is added to the end of the file. That is, the first page of the newly allocated space is page x + 1 on the file you’re enlarging. When you shrink a database by using the DBCC SHRINKDATABASE or DBCC SHRINKFILE command, ...
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