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Going Beyond the Built-in Functionality
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Windows Reliability and Performance Monitor is a great tool for capturing performance data, but analyzing it is much harder, particularly when you have an obscure performance problem To help you analyze Performance Monitor logs more easily, you can download a free open source tool written by engineers at Microsoft, called Performance and Analysis of Logs, from http://codeplexcom/pal It not only analyzes the data for you but also provides a full report with charts highlighting performance problems and full descriptions of the counters and thresholds involved
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Activity Monitor provides a quick and easy way to discover who is doing what on a SQL Server instance and how busy the instance is Activity Monitor was completely rewritten and redesigned for SQL Server 2008 and provides far more features and information
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than was possible in its previous incarnation You access the tool by right-clicking the instance name in SQL Server Management Studio and selecting Activity Monitor, which opens the Overview panel, as shown in Figure 8-6 You re immediately presented with four charts: % Processor Time Plots the amount of CPU being used by the SQL Server instance that you re connected to, which is particularly useful under high CPU usage conditions to con rm that it is actually SQL Server that s responsible Waiting Tasks Plots the number of tasks that are currently waiting for something This is good to give you a heads-up that something is going wrong Database I/O Plots the I/O throughput for all your data and transaction log les, which indicates how much load is on your underlying storage Batch Requests/sec Plots the number of batch requests that SQL Server is processing every second, which shows how busy SQL Server is Beneath the charts you ll notice four expandable sections, explained in turn next
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The Processes panel is the place that you most commonly visit once you start using Activity Monitor It presents a view of all current connections with lots of details, a few of which can be seen in Figure 8-7
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Figure 8-6
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C h a p t e r 8 : Pe r f o r m a n c e Tu n i n g a n d O p t i m i z a t i o n
Figure 8-7
SQL Server Activity Monitor, Processes panel
The following are the three most useful uses for this view: You can lter on any column by clicking the drop-down arrow for that column and selecting an option For instance, you can quickly restrict your view to one particular database, login, or computer name You can also use it to view all connections that are currently experiencing one particular wait type, are being blocked by another process, or are at the head of a blocking chain Powerful stu ! Once you ve identi ed the sessions that interest you, you can quickly kill a troublesome connection by right-clicking the connection in Activity Monitor and selecting Kill Process But before you do that, you might want to see what the process is working on To do that, you right-click and select Details to see the last T-SQL batch that was run on that connection, helping you to target the area of the application that caused a problem If viewing the last T-SQL batch doesn t give you enough detail, then you can right-click a session and select Trace Process in SQL Server Pro ler to launch Pro ler using the standard template but with an automatic lter on the session that you re interested in
Resource Waits
The Resource Waits panel provides aggregated information for current waits by wait type and also shows the cumulative wait time for each wait type You can read more about SQL Server waits and wait types in the upcoming section Dynamic Management Views
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Figure 8-8
SQL Server Activity Monitor, Data File I/O panel
Data File I/O
The Data File I/O panel of Activity Monitor provides an excellent view of I/O load and performance that can be ordered by database and even filename You can see an example snapshot of this in Figure 8-8 This view makes it very easy to determine which files in which databases currently have the heaviest I/O requirements and, most importantly, the I/O response times for those files, which indicates the latency between SQL Server making an I/O request and actually receiving it The response times should be less than 5 ms for a transaction log file and less than 10 ms for a data file on a system that is performing well; anything consistently over 20 ms should be considered unacceptable if you re having perceived performance problems
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