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In 2001, I was consulting for the United Nations in East Timor. Specifically, I was asked to analyse a mission-critical database system for this emerging nation. The Civil Registry database was going to be used for elections and would act as the foundation for the country s civil services. Unfortunately, the design and implementation had been rushed due to various pressures, and there was a concern about it s efficacy, so I was asked to perform an audit and analysis. There was no documentation for the database design, nor, more importantly, the various Visual Basic applications that had been written. In my opinion, the database design was not optimal, and there were a lot of custom software components
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used due to the obvious security requirements of a database solution that had collected data on the entire population of East Timor. It is only through the use of SQL Server Profiler that I was able to reverse-engineer how the application and entire database solution worked. Importantly, it also provided me with the evidence required to justify my conclusions and recommendations to management. Without SQL Server Profiler, there would have been a lot of guesswork and conjecture. I highly recommend you invest the energy and time in learning how to use this very powerful and important tool.
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Another technique for tracing the activity between client applications and a SQL Server instance is to create traces through a set of system stored procedures instead of using SQL Server Profiler.
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Table 29-1 SQL Trace Stored Procedures Stored Procedure fn_trace_geteventinfo fn_trace_getfilterinfo fn_trace_getinfo sp_trace_create sp_trace_generateevent sp_trace_setevent sp_trace_setfilter sp_trace_setstatus Description Returns information about events included in a trace. Returns information about filters applied to a trace. Returns information about a specified trace. (Or all existing traces.) Creates a trace definition Creates a user-defined event Adds or removes an event class or column to a trace Applies a filter to a trace Closes, starts or stops a trace
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More Info For more information on how to create traces manually, see the topic Introducing SQL Trace in SQL Server 2005 Books Online.
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Dynamic Management Views and Functions
Dynamic Management Views (DMV) and Functions are relational entities that expose SQL Server in memory structures and can be queried using your standard DML statements. They are quick to query and have a low overhead as they expose information that needs to be maintained by the database engine. This information is ideal for performance tuning and troubleshooting your SQL Server instance. We will examine DMVs in more detail in 31.
29
Database System Tuning
Note
DMVs are not exactly new, as they did exist in earlier versions of SQL Server. The sysprocesses system table is one such example.
Determining SQL Server Performance Bottlenecks
Once you have determined that you have a performance bottleneck problem and that it is related to your SQL Server instance, you need to further drill down into the appropriate SQL Server subsystem to determine the cause of the bottleneck and hopefully be able to tune your SQL Server solution.
Determining Processor Bottlenecks
Once you have identified that your SQL Server instance is consuming the processor resources, as explained above, you must identify the cause. The following DMVs can be queried to gather more metrics about how the SQL Server database engine is utilizing the processors:
Look for high values in the runnable_tasks_count column of sys.dm_os_schedulers DMV, that would indicate a processor bottleneck.
Query the sys.dm_exec_query_stats DMV, as shown below, aggregating the total_worker_time and execution_count columns to help determine which queries are consuming the most processor resources. The plan_handle value can be passed to the dm_exec_query_plan dynamic management function to see the execution plan for further analysis.
SELECT plan_handle, SUM(total_worker_time) AS total_cpu_time, SUM(execution_count) AS total_execution_count, COUNT(*) AS number_of_statements
FROM sys.dm_exec_query_stats AS QueryStats GROUP BY plan_handle ORDER BY sum(total_worker_time) DESC;
The main causes for high processor utilization for a SQL Server instance include the following:
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