Contents
How is a histogram similar to an event counter?
The histogram target behaves similarly to the event_counter target. The event_counter target counts the number of times that an event occurs. However, the histogram target lets you pick a grouping mechanism for the histogram. You can use either an action, or an event field.
What happens to data stored in extended events?
The data stored within the target will be lost when the SQL Server is restarted. Within the article, we will go true the creation of an Extended Events session; the configuration parameters of the Event Pairing target, and obtain meaningful data from it.
What is the definition of a histogram in memory?
In my case, the definition of the histogram is that I’m counting auto_stats events and grouping them by a selected event field, the object_id. Because the histogram is in memory, you have a couple of ways to looking at it. If you use SSMS, you can look at the session in the Object Explorer:
When to use different targets for extended events?
Extended event sessions can use multiple targets to store captured information. We should use different targets depending on the type of data we are capturing and the structure of the data outcome we desire.
Which is an example of an extended event?
The single most important thing to remember about Extended Events is that this functionality is not simply a replacement for Profiler/Trace, but a whole new tool with new functionality. My first example for functionality that you simply cannot get in Profiler/Trace is the ability to output to a Histogram.
What are the targets for extended events in SQL Server?
The source_type parameter is the key to controlling the histogram target: source_type=0 – Means collect data for event fields ). source_type=1 – Means collect data for actions . 1 is the default. The ‘slots’ parameter default is 256. If you assign another value, the value is rounded up to the next power of 2.
Can a target be the same as extended events?
Extended Events can have a target that is a file, same as Profiler. However, you can also have a target: Read about each of the types in the Microsoft documentation here.