Diagnose chatty applications with batch rates, cached executions, bounded session event counts, and measured round trips per user action.
Live Plans for Running Queries With sys.dm_exec_query_statistics_xml
Read sys.dm_exec_query_statistics_xml for live plans, compare profile counts with estimates, and interpret partial progress carefully.
Latch Waits at the Top: Reading sys.dm_os_latch_stats
Sample SQL Server latch waits by class, then connect ACCESS_METHODS_DATASET_PARENT, FGCB_ADD_REMOVE, and LOG_MANAGER to the next check.
Top Three Wait Stats and What Each One Means
The top three wait stats in the files people sent in were CXPACKET, SOS_SCHEDULER_YIELD and ASYNC_IO_COMPLETION. A small demo makes each wait happen and measures it with session wait statistics. The post explains what each one means and what to check next.
Wait Stats for Performance – SQL in Sixty Seconds #157
I finally decided to create a video on that topic on my SQL in Sixty Seconds Channel. I will create more videos on the topic Wait Stats for Performance.
Waits Since Restart: A Wait Stats Query With Uptime Rates
Waits since restart show where a SQL Server spends its waiting time. One query ranks the real waits, removes the idle ones, and adds the average wait, the signal share and a rate per hour of uptime. A table maps the common waits to the area to check next.
RESOURCE_SEMAPHORE vs THREADPOOL: Two Waits, Two Fixes
RESOURCE_SEMAPHORE vs THREADPOOL tells you whether a task waits for memory or for a worker thread. This post reads both counters and checks for live waits. A demo shows how an index shrinks a memory grant from 38,216 KB to zero.