.net qr code generator open source 6: Basic Troubleshooting in .NET framework

Generator QR Code JIS X 0510 in .NET framework 6: Basic Troubleshooting

CHAPTER 6: Basic Troubleshooting
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Figure 6 4. Navigating to the dynamic management views
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Disk I/O
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Some of the DMV s that will help you to determine disk I/O issues include the following: sys.dm_db_file_space_usage sys.dm_db_index_operational_stats sys.dm_db_index_usage_stats sys.dm_exec_query_stats sys.dm_exec_query_plan sys.dm_io_virtual_file_stats sys.dm_io_pending_io_requests sys.dm_os_wait_stats sys.dm_os_waiting_tasks
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CHAPTER 6: Basic Troubleshooting
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Here is an example T-SQL script that will help you use the sys.dm_io_virtual_file_stats DMV to find data files that are producing the highest average number of milliseconds per I/O:
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SELECT io_stall / (num_of_reads + num_of_writes) AS avg_ms_per_io, io_stall AS io_stall_ms, (num_of_reads + num_of_writes) AS num_io, DB_NAME (database_id) AS database_name, file_id FROM sys.dm_io_virtual_file_stats (null, null) WHERE (num_of_reads + num_of_writes) > 500 ORDER BY 1 DESC
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Some of the DMV s that will help you to determine memory issues include the following: sys.dm_os_cache_counters sys.dm_os_memory_clerks sys.dm_os_memory_cache_clock_hands sys.dm_os_process_memory sys.dm_os_ring_buffers sys.dm_os_sys_memory sys.dm_os_virtual_address_dump sys.dm_os_wait_stats sys.dm_os_waiting_tasks Here is an example T-SQL script that will help you use the sys.dm_os_buffer_descriptors DMV to find the databases that have the most data pages currently residing in the buffer pool:
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SELECT COUNT(*) AS cached_pages, CASE database_id WHEN 32767 THEN 'ResourceDb' ELSE DB_NAME(database_id) END AS [database] FROM sys.dm_os_buffer_descriptors GROUP BY DB_NAME(database_id), database_id ORDER BY cached_pages DESC
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Some of the DMV s that will help you to determine CPU issues include the following: sys.dm_exec_cached_plans sys.dm_exec_query_stats sys.dm_exec_query_optimizer_info
CHAPTER 6: Basic Troubleshooting
sys.dm_exec_requests sys.dm_exec_sessions sys.dm_os_schedulers sys.dm_os_wait_stats sys.dm_os_waiting_tasks Here is an example T-SQL script that will help you use the sys.dm_os_schedulers DMV to locate possible CPU issues by identifying the number of tasks currently waiting to be run on a CPU:
SELECT scheduler_id, current_tasks_count, runnable_tasks_count FROM sys.dm_os_schedulers WHERE scheduler_id < 255
Did you happen to notice I listed these DMV s twice sys.dm_os_wait_stats sys.dm_os_waiting_tasks These DMV s help to identify the wait stats and types for the activity on your server since the last restart. Wait stats may be one of the most powerful tools you have when it comes to troubleshooting performance issues. Even this simple query:
select top 10 * from sys.dm_os_wait_stats order by wait_time_ms desc
can yield a wealth of information in a short amount of time. While other DBA s are fumbling around to launch SQL Profiler, you could have already isolated the query, what it is waiting for, and propose a possible solution.
Wait Stats
Most people are familiar with the indoor/outdoor thermometers that are sold in stores. These devices let you see the temperature in both places at the same time. They don t really offer an advantage over the traditional method of placing a thermometer outside your window. In fact, unless the probe is placed properly, the reading you get outside may be off by a good amount. In the end, we all check the real temperature outside by opening a door or window and feeling the air on our skin. Now consider your phone rings and the voice on the other end says the server is slow. You have a handful of tools at your disposal to look inside the database engine to find out what is happening. In short, you have someone on the outside observing one temperature, and you can look inside for another temperature. Wait stats are a way for you to feel the air on your skin. They allow for you to immediately know what the issue is, and often times can provide you a solution. They are a hidden gem when it comes to troubleshooting, allowing you to diagnose performance issues in a fraction of the time compared to other tools.
CHAPTER 6: Basic Troubleshooting
Wait stats can be found through the use of perfmon and the SQLServer:Wait Statistics object. They are also included in the Activity Monitor, having their own section located below the graphs that are displayed. The best usage of wait stats is in the understanding of wait types. A list of wait types can be found at: http://msdn.microsoft.com/enus/library/ms179984.aspx. You can find the wait type inside of the sys.dm_os_wait_stats DMV, and you can also find it in the Processes section of the Activity Monitor. TIP: I would wager a pound of bacon that a majority of the wait types you come across can be solved with some advanced index tuning. Examine some query plans before purchasing new hardware; you ll be doing yourself a favor.
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