Monitoring and Troubleshooting SQL Server Performance in VS .NET

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Monitoring and Troubleshooting SQL Server Performance
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An easier way to translate handle information
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Although it might be interesting to find handles in the query stats or cached plan DMVs and then input them into the DMFs to translate everything into human-readable format, there is an easier way to achieve this translation. The CROSS APPLY operator invokes a table-valued function for each row within a table. Thus, you can use the following queries to apply this translation for given rows in the query stats or cached plans DMVs:
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SELECT * FROM sys.dm_exec_query_stats CROSS APPLY sys.dm_exec_query_plan(plan_handle) SELECT * FROM sys.dm_exec_query_stats CROSS APPLY sys.dm_exec_sql_text(sql_handle) SELECT * FROM sys.dm_exec_cached_plans CROSS APPLY sys.dm_exec_query_plan(plan_handle)
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Because an operational system can easily have thousands of rows in sys.dm_exec_query_stats or sys.dm_exec_cached_plans, you shouldn t execute the previous queries without providing a WHERE clause to restrict the scope.
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I/O Statistics
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The DMVs and DMFs that deal with I/O track the physical I/O to the data files and the log files for each database. A key DMF in this category is sys.dm_io_virtual_file_stats, which takes two parameters: database ID and file ID (both of which can be null). This DMF is comparable to the fn_virtual_filestats() function in SQL Server 2000, but it contains more granular information to enable you to make better decisions. The virtual file stats DMF breaks down the physical I/O written to each file within a database into reads, writes, bytes read, and bytes written. It also tracks I/O stalls, broken down by reads and writes. The I/O statistics are cumulative from the time the SQL Server instance was started. This DMF helps you evaluate whether you have an I/O imbalance between files for your database. And this information, in turn, enables you to determine whether tables or indexes should be moved to provide better throughput from physical reads or writes. Another useful DMF in the I/O statistics category is sys.dm_io_pending_io_requests, which contains a row for each request that is waiting for an I/O operation to complete. On a very active system, you always find requests that are pending. However, if you find a particular request that has to wait a significant amount of time or you have very large numbers of requests that are pending all the time, you might have a disk I/O bottleneck.
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The final category of DMVs covered in this lesson deals with the operating system interface between SQL Server and Windows as well as the physical hardware interaction.
Lesson 4: Using Dynamic Management Views and Functions
Although you can use System Monitor to gather a variety of counters, the logs gathered are not formatted to allow you to easily extract and correlate the data with a variety of other sources. To get a result set that you can more easily manipulate, you can use the sys.dm_os_performance_counters DMV. This view provides all the counters that a SQL Server instance exposes in an easily manipulated result set.
NOTE
Accessing hardware counters
Keep in mind that the performance counters DMV provides only SQL Server counters and does not allow access to any hardware counters. To access hardware counters, you have to make Windows Management Instrumentation (WMI) calls to pull the data into a result set that you can then manipulate.
Another key DMV for hardware statistics is sys.dm_os_wait_stats, which provides the same data that you could gather by using DBCC SQLPERF(WAITSTATS) in SQL Server 2000. This DMV plays an important role in any performance analysis by aggregating the amount of time processes had to wait for various resources to be allocated.
MORE INFO
Wait types
SQL Server 2000 had 77 wait types. SQL Server 2005 exposes 194 wait types. Although a complete discussion of each wait type is beyond the scope of this book, for details about wait types see Gert Drapers SQLDEV.Net Web site at www.sqldev.net/misc/sp_waitstats.htm.
Quick Check
What function do DMVs and DMFs play in a monitoring and analysis system DMVs and DMFs provide a rich granular instrumentation platform for SQL Server 2005, providing the core resources for gathering virtually any type of data for an instance or a database.
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