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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Caching Mechanisms
SQL Server can avoid compilations of previously executed queries by using four mechanisms to make plan caching accessible in a wide set of situations:
Adhoc query caching
Autoparameterization
Prepared queries, using either sp_executesql or the prepare and execute method invoked through your API
Stored procedures or other compiled objects (triggers, TVFs, etc.)
To determine which mechanism is being used for each plan in cache, we need to look at the values in the cacheobjtype and objtype columns in the sys.dm_exec_cached_plans view. The cacheobjtype column can have one of six possible values:
Compiled Plan
Compiled Plan Stub
Parse Tree
Extended Proc
CLR Compiled Func
CLR Compiled Proc
In this section, the only values we are looking at are ...
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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.