This wait stats summary puts every wait from the series on one page: what it means and the first fix to try. On Night 28 at the Clipboard Diner, the critic finally comes on an ordinary Tuesday. The lesson of the whole series is the same as the story’s: know what normal looks like on your server.
Wait Stats Troubleshooting: From Top Wait to First Fix
Wait stats troubleshooting comes down to one habit: find the top real wait, ask its first question, and try one fix. On Night 27 at the Clipboard Diner, Casey tapes a one-page chart to the fridge. Here is that chart for SQL Server, plus one query that shows your top waits with their share and signal percent.
Batch Mode Wait Stats: HTBUILD and Columnstore Waits
Batch mode wait stats such as HTBUILD and BPSORT show threads waiting for each other inside a parallel batch mode plan. On Night 26 at the Clipboard Diner, four cooks wait for one giant shared tray before 900 cookies can bake. Then I show when these waits are normal, when skew or spills make them a problem, and how to check them.
RESOURCE_SEMAPHORE Wait Stats: Memory Grant Waits
RESOURCE_SEMAPHORE wait stats mean a query is waiting for memory before it can even start. On Night 25 at the Clipboard Diner, a wedding party reserves the whole counter and two birthday parties wait. Then I show how to find waiting grants, why grants grow too big, and the fixes I try first.
Optimized Locking Wait Stats: New Lock Waits in SQL Server 2025
Optimized locking wait stats are the new lock waits SQL Server 2025 records when optimized locking is on. On Night 24 at the Clipboard Diner, a new state code swaps booth cards for wristbands. Then I show what LCK_M_S_XACT_MODIFY and LCK_M_S_XACT_READ mean, how to check the setting, and why a long transaction still hurts.
OLEDB Wait Stats: Linked Servers and Remote Calls
OLEDB wait stats measure the time SQL Server spends in calls to an OLE DB provider, and that usually means a linked server. On Night 23 at the Clipboard Diner, the pie case is empty and Jules crosses the street for every slice. Learn how to find the waiting session, how OPENQUERY filters on the remote side, and when to keep a local copy instead.
HADR_SYNC_COMMIT Wait Stats: Availability Group Commits
HADR_SYNC_COMMIT wait stats measure how long a commit waits for a synchronous secondary replica to harden the log. On Night 22 at the Clipboard Diner, every sale is phoned to a sister diner before the plate can leave. Learn what the wait includes, how to read the send and redo queues, and the fixes from the secondary’s log disk to asynchronous commit.