barcode 128 generator c# XEVENT: the next event infrastructure in C#

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XEVENT: the next event infrastructure
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Occurs when you use a feature that will be removed from a future version of SQL Server, but will not be removed from the next major release of SQL Server. Maps allow you to associate internal values to more meaningful descriptions. If you understand the principles behind database normalization, it would make sense to you to store locking modes as byte data types rather than strings. But then, you d have to know that lock mode 18 means RangeI-X. That s exactly what maps allow you to do by using the sys.dm_xe_map_values DMV.
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Sessions
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Sessions contain targets and the enabled events. The same event can be enabled in multiple sessions. The binding of actions and predicates is done per session level. Sessions provide policy support for buffering (how the event data is stored) and dispatch (the time the data is retained in the buffers). Sessions are also a security boundary (the user-level permissions are checked per session when the session is created or altered). The mapping between package objects and sessions is many-to-many. The event sessions can be created and managed through the DDL statements CREATE EVENT SESSION and ALTER EVENT SESSION. The event session DDL statements allow you to add targets, events, predicates, actions, and event session level options; set an event session to autostart at server startup; and add or remove targets and events from running event sessions.
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The final section of this chapter is dedicated to real-life XEVENT usage scenarios as well as to some performance considerations.
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Usage scenarios
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Extended Events are likely to become the preferred method of monitoring and troubleshooting; therefore, the following are some possible usage scenarios: Monitoring system activity using Extended Events and Event Tracing for Windows (ETW) Determining which queries are holding locks Finding objects with the most locks taken on them Determining which queries are exceeding certain thresholds (such as a specified duration) Tracking waits Tracking spinlock contention (spinlocks are low-level synchronization objects used to protect access to resources for short periods of time) Investigating latch contention Generating a user dump
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The number of usage scenarios is quite large and beyond the scope of this chapter. But, to give you another example of using XEVENT, listing 7 shows how to generate a user dump when an error occurs.
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Listing 7 Generating a user dump
USE master; GO -- trigger a user dump for the error 208 -- 'Invalid object name' CREATE EVENT SESSION GenerateUserDump ON SERVER ADD EVENT sqlos.exception_ring_buffer_recorded ( ACTION (sqlserver.create_dump_single_thread) WHERE (error = 208 and state=1 and package0.counter < 2)); GO ALTER EVENT SESSION GenerateUserDump ON SERVER STATE=START; GO -- Generate the 208 error SELECT * FROM NonExistentTable; -- Cleanup DROP EVENT SESSION GenerateUserDump ON SERVER; GO
After generating the error, if you inspect the SQL Server error log, you ll find something similar to listing 8.
Listing 8 Output from running listing 7
Source Message ------ -------------------------------------------------------------------spid51 External dump process return code 0x20000001.<nl/>External dump process returned no errors. spid51 Stack Signature for the dump is 0xC0D2B2AE spid51 Short Stack Dump spid51 * -----------------------------------------------------------------spid51 * ****************************************************************** spid51 * spid51 * SELECT * FROM NonExistentTable; spid51 * Input Buffer 92 bytes spid51 * spid51 * Dump triggered by event 'exception_ring_buffer_recorded'. spid51 * spid51 * BEGIN STACK DUMP: spid51 * spid51 ******************************************************************** spid51 ***Stack Dump being sent to C:\Program Files\Microsoft SQL Server\MSSQL10.MSSQLSERVER\MSSQL\LOG\SQLDump0002.txt spid51 * spid51 * User initiated stack dump. This is not a server exception dump.
XEVENT: the next event infrastructure
System health session
One feature based on Extended Events is the SQL Server Audit feature that allows you to monitor server-level and database-level groups of events or individual events. Whereas the SQL Server Audit is known and well documented, the system health session, another feature based on XEVENT, is quite unheard of. The system health session is an always-on session that captures events considered unhealthy. The events are captured using the ring buffer target. To convince yourself, run the statement shown in listing 9.
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