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Once the session is started, the ring buffer target is updated with new events (assuming there are any) every second. Each of the in-memory targets the ring buffer, bucketizers, and event count targets exposes its data in XML format in the target_data column of the sys.dm_xe_session_targets DMV. Given the fact that the data is in XML format, many DBAs who have not yet delved into XQuery may want to try it; we highly recommend learning how to query the data, given the richness of the information that can be retrieved using XE. Consuming the XML in a tabular format requires knowledge of which nodes are present. In the case of the ring buffer target, a root node called RingBufferTarget includes one event node for each event that res. The event node contains one data node for each attribute contained within the event data, and one action node for actions bound to the event. These data and action nodes contain three nodes each: one node called type, which indicates the data type; one called value, which includes the value in most cases; and one called text which is there for longer text values. Explaining how to query every possible event and target is beyond the scope of this book, but a quick sample query based on the statement_completed session follows; you can use this query as a base from which to work up queries against other events and actions when working with the ring buffer target:

SELECT theNodes.event_data.value('(data/value)[1]', 'bigint') AS source_database_id, theNodes.event_data.value('(data/value)[2]', 'bigint') AS object_id, theNodes.event_data.value('(data/value)[3]', 'bigint') AS object_type, theNodes.event_data.value('(data/value)[4]', 'bigint') AS cpu, theNodes.event_data.value('(data/value)[5]', 'bigint') AS duration, theNodes.event_data.value('(data/value)[6]', 'bigint') AS reads, theNodes.event_data.value('(data/value)[7]', 'bigint') AS writes, theNodes.event_data.value('(action/value)[1]', 'nvarchar(max)') AS sql_text FROM ( SELECT CONVERT(XML, st.target_data) AS ring_buffer FROM sys.dm_xe_sessions s JOIN sys.dm_xe_session_targets st ON s.address = st.event_session_address WHERE s.name = 'statement_completed' ) AS theData CROSS APPLY theData.ring_buffer.nodes('//RingBufferTarget/event') theNodes (event_data);

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This query converts the ring buffer data to an XML instance and then uses the nodes XML function to create one row per event node found. It then uses the ordinal positions of the various data elements within the event nodes to map the data to output columns. Of course, more advanced sessions require more advanced XQuery to determine the type of each event and do some case logic if the events involved in the session have different schemas which, thankfully, the two in this example do not. Once you ve gotten to this point, the data is just that standard tabular data, which can be aggregated, joined, inserted into a table, or whatever else you want to do with it. You can also read from the asynchronous le target via T-SQL, using the sys.fn_xe_ le_target_ read_ le table-valued function. This function returns one row per event, but you still have to get comfortable with XML; the event s data, exposed in a column called event_data, is in an XML format similar to data in the ring buffer target. Eventually we can expect a user interface to bear some of the XML burden for us, but just as with SQL Trace, even the most powerful user interfaces aren t enough when complex analysis is required. Therefore, XML is here to stay for those DBAs who wish to be XE power users.

Once you have nished reading data from the event session, it can be stopped using the following code:

.

ALTER EVENT SESSION [statement_completed] ON SERVER STATE=STOP;

Stopping the event session does not remove the metadata; to eliminate the session from the server completely, you must drop it using the following statement:

Status bar The status bar displays a wide variety of information corresponding to the state of certain active operations. For instance, when you load a project, you ll see a message on your screen such as Loading project c:\blabla\blabla.csproj from your hard drive. When you re building an application, you ll see something like Build started, and when the application has finished, you ll see Build succeeded or Build failed depending on the success of the process.

ALTER EVENT SESSION [statement_completed] ON SERVER;

Summary

SQL Server has many eventing systems that range from the simple like triggers and event noti cations to the intricate like XE. Each of these systems is designed to help both users and SQL Server itself work better by enabling arbitrary code execution or data collection when speci c actions occur in the database engine. In this chapter, we explored the various hidden and internal objects used by Change Tracking to help support synchronization applications, the inner workings of the ubiquitous SQL Trace infrastructure, and the complex architecture of XE, the future of eventing within SQL Server. Events within SQL Server are extremely powerful, and we hope that this chapter has provided you with enough internal knowledge of these systems to understand how to better use the many eventing features in your day-to-day activities.

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