January 2008
Intermediate to advanced
575 pages
16h 10m
English
book
Professional SQL Server® 2005 Performance Tuning
by Steven Wort, Christian Bolton, Justin Langford, Michael Cape, Joshua J. Jin, Douglas Hinson, Haidong Ji, Paul A. Mestemaker, Arindam Sen
Content preview from Professional SQL Server® 2005 Performance Tuning
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3.8. Monitoring Wait Statistics
There is a new performance object for SQL Server 2005 that monitors wait types. This counter contains wait information for specific global resources that may experience contention and therefore cause performance problems.
Each counter object contains the same four instances that describe wait times (average and cumulative), waits in progress, or waits started per second.
SQLServer:Wait Statistics — Lock Waits: This counter will give you an idea of whether processes are waiting too long to acquire locks. Measuring the ability of a process to acquire a lock is useful in terms of determining whether locking is an issue.
SQLServer:Wait Statistics — Memory Grant Queue Waits: Shows the number of processes or length of time processes spend queuing waiting for memory grants to become available.
SQLServer:Wait Statistics — Page I/O Latches: SQL Server requires latches to ensure data synchronization. The availability of latches directly affects SQL Server performance and as such, monitoring latches in the event of poor performance can be useful in identifying the root cause.
There are another nine performance counters within the Wait Statistics object, many of which can be useful in specific troubleshooting circumstances. Take a look through the description in SQL Server Books Online for a description of each of these, as you'll find it beneficial to be familiar with them.
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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.