March 2009
Intermediate to advanced
784 pages
30h 30m
English
book
Microsoft® SQL Server® 2008 Internals
by Paul Randal Kalen Delaney Kimberly Tripp, and Conor Cunningham
Content preview from Microsoft® SQL Server® 2008 InternalsBecome 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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Physical Index Structures
Index pages have almost the same structure as data pages except that they store index records instead of data records. As with all other types of pages in SQL Server, index pages use a fixed size of 8 KB, or 8,192 bytes. Index pages also have a 96-byte header, and there is an offset array at the end of the page with 2 bytes for each row to indicate the offset of that row on the page. A nonclustered index can have all three allocation units associated with it: IN_ROW_DATA, ROW_OVERFLOW_DATA, and LOB_DATA. Each index has a row in the sys.indexes catalog view, with an index_id value of either 1 (for a clustered index) or a number between 2 and 250 or between 256 and 1005 (indicating a nonclustered index). Remember that SQL ...
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I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.