October 2003
Intermediate to advanced
1072 pages
24h 21m
English
Content preview from Guru's Guide to SQL Server Architecture and Internals, TheBecome 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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Preemptive vs. Cooperative Tasking
An important difference—in fact, probably the most important difference—between Windows' scheduler and SQL Server's UMS is that Windows' scheduler is a preemptive scheduler, while UMS implements a cooperative model. What does this mean? It means that Windows prevents a single thread from monopolizing a processor. As we discussed in Chapter 3, each thread gets a specified time slice in which to run, after which Windows automatically schedules it off the processor and allows another thread to run if one is ready to do so. UMS, by contrast, relies on threads to voluntarily yield. If a SQL Server worker thread does not voluntarily yield, it will likely prevent other threads from running.
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
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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.