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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.

-- 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 . sqlserver developer

-- Split: Get all orders for given list of IDs DECLARE @Ids VARCHAR(MAX) = '101,205,389,476'; SELECT o.* FROM Orders o INNER JOIN STRING_SPLIT(@Ids, ',') AS s ON o.OrderId = CAST(s.value AS INT); -- Aggregate: Build a comma-separated list of product names for a category SELECT CategoryId, STRING_AGG(ProductName, ', ') WITHIN GROUP (ORDER BY ProductName) AS Products FROM Products GROUP BY CategoryId; EXEC dbo