Performance counter updating error
It’s available in all SQL Server editions and gives the results instantly.
With additional coding, you can periodically query the view and store captured data in repository table(s).
Cache Hit Ratio appears in the Plan Cache, Cursor Manager by Type, and Catalog Metadata categories.
These counters show the last observed, not the average value. Time Between Batches (ms), and more The cntr_types column value for the PERF_LARGE_RAW_FRACTION counter type is 537003264. fraction between two values – the PERF_LARGE_RAW_FRACTION counter and its corresponding PERF_LARGE_RAW_BASE counter value Again, additional calculation is needed to find out the value that can be used for monitoring and troubleshooting performance issues.
It’s usually used to monitor object counts This means that if you’re monitoring a counter type 65792, the value you get in the counter_value column when you query the view is the current value of the counter and no additional calculation is required To find out the current values for the Buffer Manager Page life expectancy, execute: The Page life expectancy is 47, no additional calculation is needed Counters of this type are: General Statistics User connections, Buffer Manager Page life expectancy and Database pages, Databases – Data and Log file size (KB), Log file used size (KB), Percent Log used, Memory Manager – Free Memory (KB), and more The cntr_types column value for the PERF_LARGE_RAW_BASE counter type is 1073939712. Average Wait Time (ms) for the interval between these two measurements is: (53736 ms -52939 ms)/(23-18) = 797 ms / 5 = 159.4 ms Counters of this type are: Average Wait Time (ms), Average Latch Wait Time (ms), Update conflict ratio, Avg. The ratio is presented in percents Buffer Cache Hit Ratio shows how SQL Server utilizes buffer cache and it is the ratio of the data pages found and read from the SQL Server buffer cache and all data page requests. The maximal possible value is 100% – when SQL Server reads all pages from the buffer cache and none from disk Knowing the counter definition and possible values can help if you’re not sure what the counter type is, or to check whether the calculated value falls into a possible value range.
You can use this info later for various analyses and creating a custom monitoring solution.
Keep in mind that the time needed for creating a custom monitoring solution may be more expensive than a third party tool Ty to be able to use the view for SQL Server performance monitoring and troubleshooting, it is necessary to understand the existing counter types, what each type represents, and how to calculate the current value.