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EXEC dbo.sp_WhoIsActive @get_plans = 1, @get_outer_command = 1; It shows: blocking chains, query text, plan, tempdb usage, and more. Your flight recorder. Force good plans, revert bad ones.

– SQL Server now rivals NoSQL for document storage. sqlserver developer

-- Running total per customer, ordered by date SELECT OrderId, CustomerId, OrderDate, Amount, SUM(Amount) OVER (PARTITION BY CustomerId ORDER BY OrderDate ROWS UNBOUNDED PRECEDING) AS RunningTotal, LAG(Amount, 1, 0) OVER (PARTITION BY CustomerId ORDER BY OrderDate) AS PreviousOrderAmount FROM Orders; Simplify date grouping. EXEC dbo

CREATE FUNCTION dbo.fn_SecurityPredicate(@SalesRep AS sysname) RETURNS TABLE WITH SCHEMABINDING AS RETURN SELECT 1 AS is_valid WHERE @SalesRep = USER_NAME() OR USER_NAME() = 'Manager'; CREATE SECURITY POLICY SalesFilter ADD FILTER PREDICATE dbo.fn_SecurityPredicate(SalesRep) ON dbo.Sales; Hide data from non-privileged users without changing app code. – SQL Server now rivals NoSQL for document storage

-- Trace flag 1222 logs deadlocks to ERRORLOG DBCC TRACEON(1222, -1); Then analyze the graph. The most common fix: ensure all procedures access tables in the .

-- Old mess: DATEADD(month, DATEDIFF(month, 0, OrderDate), 0) -- New clean: SELECT DATETRUNC(month, OrderDate) AS OrderMonth, SUM(Amount) FROM Orders GROUP BY DATETRUNC(month, OrderDate); -- Time-series bucketing (every 3 days) SELECT DATE_BUCKET(day, 3, OrderDate) AS Bucket, COUNT(*) FROM Orders GROUP BY DATE_BUCKET(day, 3, OrderDate); Nothing ruins a production system faster than deadlocks and long-held locks. 4.1 Isolation Levels – Choose Wisely | Level | Anomaly Prevented | Concurrency Impact | |-------|-------------------|--------------------| | READ UNCOMMITTED (or NOLOCK hint) | None (dirty reads possible) | High (no shared locks) | | READ COMMITTED (default) | Dirty reads | Medium (locks held briefly) | | REPEATABLE READ | Non-repeatable reads | Lower (holds locks until end of transaction) | | SERIALIZABLE | Phantom reads | Very low (range locks) | | READ COMMITTED SNAPSHOT (RCSI) | Dirty reads via row versioning | High (no locks for readers) |