Welcome, CXCONSUMER

Erik Darling points out that CXCONSUMER is now a wait type in SQL Server:

According to Pedro’s slide, but not the ENTIRELY MISSING DOCUMENTATION, this wait is the “safe” type of parallelism wait.

It’s a good thing Pedro is a dutiful blogger, so we don’t have to pull our hair out while unfurling these mysteries.

Speaking of documentation, our new CXCONSUMER friend isn’t mentioned in Query Store Wait Stats, either.

This is a very useful addition.

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Tracking xp_cmdshell Executions

Jason Brimhall shows how you can see when someone calls xp_cmdshell, including the call details: What was the wait_type? Well, the obscure wait_type was called PREEMPTIVE_OS_PIPEOPS. What causes this wait? As it turns out, this is a generic wait that is caused by SQL pipe related activities such as xp_cmdshell. Knowing this much information however does not […]

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Dealing with HADR_SYNC_COMMIT Waits

Dmitri Korokevitch walks us through the HADR_SYNC_COMMIT wait type: The secondary nodes may be configured using asynchronous or synchronous commit. With asynchronous commit, transaction considered to be committed and all locks were released when COMMIT log record is hardened on the primary node. SQL Server sends COMMIT record to secondary node; however, it does not […]

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