Prevent lost updates with optimistic concurrency and a rowversion token, detect zero-row conflicts, and compare short locking transactions.
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.
THREADPOOL Wait Stats: When Worker Threads Run Out
THREADPOOL wait stats mean a task is waiting for a worker thread because every worker is already busy. On Night 16 at the Clipboard Diner, every cook holds a ticket that can’t move, and nobody is free to take a new order. Then two queries show how close your server is to its worker limit, and how to get in when nobody else can.
LCK_M Wait Stats: Lock Waits and Blocking
LCK_M wait stats show how long queries wait for a lock that another session holds. On Night 15 at the Clipboard Diner, a party in booth 7 pays and then won’t leave, and three parties wait behind it. Then two queries find the blocking chain and its head blocker on your own server.
Live Wait Stats: What Is Waiting Right Now
Live wait stats show what every request in SQL Server is waiting on at this moment, and who is in its way. On Night 4 at the Clipboard Diner, the Saturday rush stalls behind a party in booth 7 that isn’t waiting for anything. Then three queries find the waiting tasks, the head blocker and one session’s own waits.
Loading a Fact Table Without Blocking Reports
Loading a fact table without blocking reports calls for isolated staging, aligned partition switching, short locks, and a tested reader path.
Indexing Foreign Keys
Indexing foreign keys can speed joins and parent deletes when child-side indexes are missing; learn how to find gaps and test write tradeoffs.