System Health XE

Kenneth Fisher describes what is in the system_health Extended Events session:

Per BOL you get the following information:

  • Errors with a severity of >= 20.

  • Memory related errors (Errors 17803, 701, 802, 8645, 8651, 8657 and 8902).

  • Non-yielding scheduler problems (Error 17883).

  • Deadlocks.

  • Sessions that have waited on locks for > 30 seconds.

  • Sessions waiting for a long time on preemptive waits (waits on external API calls).

Read on to learn more of the things this session contains as well as a couple ways you can access the data.

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Viewing Deadlock Graphs With The system_health Session

Jes Borland shows how you can avoid using trace flags 1204 and 1222 and view deadlocks from the system_health Extended Event: This one isn’t bad, but imagine a multi-statement deadlock, or a server with several deadlocks in an hour – how do you easily see if there were other errors on the server at the […]

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Something’s Missing: Head Operators In Extended Event-Based Execution Plans

Grant Fritchey notices something odd about execution plans grabbed from an Extended Events session: Notice anything missing? Yeah, the first operator, the SELECT operator (technically, not really an operator, but they don’t have any name or designation in the official documentation, so I’m calling them operators). It’s not there. Why do I care? Because it’s […]

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