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.
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.
SQL SERVER – 3 Different Ways to Set MAXDOP
There are 3 different MAXDOP scopes: instance, database and statement. Readers of my 16-versus-1 demonstration asked where to configure it.
SQL SERVER – 16 CPU vs 1 CPU : Performance Comparison – SQL in Sixty Seconds #142
Well, let us figure out the answer to this question in today’s blog post where I will be doing a performance comparison of 16 CPU vs 1 CPU.
SQL SERVER – SQLOS Scheduler and the Process States
I strongly suggest that you first watch it before we continue on today’s topic of SQLOS Scheduler and the Process States.
List All Parallel Queries – SQL in Sixty Seconds #098
During the recent Comprehensive Database Performance Health Check, my client asked me if I have a query which can list all the parallel queries.
Visible Offline Schedulers: Find CPUs SQL Server Ignores
Visible offline schedulers are CPUs that Windows shows and SQL Server refuses to use. This post reads the scheduler status with tested queries, compares it with the CPU count and affinity, and explains the two common causes. It also shows the statement that returns the CPUs to automatic affinity.