Blocked Process Report: monitorLoop

Michael Swart explains what the “monitorLoop” attribute is on the blocked process report:

You won’t find too much explanation about that field in the official documentation but I believe I know what it means.

The blocked process report is closely tied to deadlock detection and it’s generated by the same process as the deadlock monitor. If you remember, the deadlock monitor runs frequently looking for deadlocks (which are just blocking chains in a circle). It runs every couple seconds when there are no deadlocks, and if it detects any, it runs a bit more frequently. Each time it runs it’s called a monitor loop. The monitorLoop is just a number that starts at zero when the server restarts and increments by one each time the monitor runs.

Read on for more details.

Related Posts

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 […]

Read More

Query Store Cleanup Can Be Blocked

Kendra Little shows that you can block Query Store cleanup: This is an isolated test system, so I went to clean out Query Store as a reset. I didn’t need any of the old information in there, so I ran: ALTER DATABASE BabbyNames SET QUERY_STORE CLEAR ALL; GO I was surprised when I didn’t see […]

Read More

Categories

February 2017
MTWTFSS
« Jan Mar »
 12345
6789101112
13141516171819
20212223242526
2728