November 2013
Intermediate to advanced
982 pages
34h 23m
English
book
Microsoft SQL Server 2012 Internals
by Bob Beauchemin Kalen Delaney Conor Cunningham, Jonathan Kehayias, Benjamin Nevarez, and Paul S. Randal
Content preview from Microsoft SQL Server 2012 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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Windowing functions
SQL Server 2012 introduces a new kind of spool associated with windowing functions. Windowing functions can compute moving averages and running totals, and the Window Spool operator is specially crafted for this kind of scenario. Spools can work in different ways. The most traditional query processing spool algorithm operates by consuming all rows from its input operators in the query tree before returning rows to the client. Other spools can cache rows as they flow through the operator (lazy spooling) for more efficient reuse later in the query. For the windowing functions, a new operator was created that spools rows based on the active windows of an ordered stream computation.
The Window Spool works as follows:
It consumes ...
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