May 2022
Intermediate to advanced
497 pages
13h 4m
English
Content preview from SQL Server Advanced Troubleshooting and Performance Tuning
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Chapter 3. Disk Subsystem Performance
SQL Server is a very I/O-intensive application: it is constantly reading data from and writing data to disk. Good I/O throughput is essential for SQL Server performance and health. Unfortunately, many SQL Server installations are I/O bound, even with modern flash-based storage.
In this chapter, I will show you how to analyze and troubleshoot disk subsystem performance issues. You will learn how SQL Server processes I/O requests internally and how to identify and detect possible bottlenecks through the entire I/O stack, on the SQL Server, OS, virtualization, and storage levels.
Next, I will talk about checkpoint process tuning, a common source of I/O bottlenecks in busy OLTP systems.
Finally, I will cover the most common I/O-related waits you may encounter in your system.
Anatomy of the SQL Server I/O Subsystem
SQL Server never works with data pages directly in database files. Every time a data page needs to be read or modified, SQL Server reads that page to memory and caches it in the buffer pool. Each page in a buffer pool is referenced by a buffer structure, sometimes simply called a buffer. It includes the page’s address in the data file, a pointer to the data page in the memory, status information, and the page latching queue.
SQL Server uses latches to protect internal objects in memory, preventing them from corruption when multiple threads are modifying them simultaneously. The two most common types of latch are exclusive, which blocks ...
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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.