Investigate why a query that used to be fast became slow, comparing plans, statistics, and data growth to find the regression root cause.
## CONTEXT A query in my production database in 2026 used to be fast and is now slow, and I need to find out what changed. I will share the query, the current execution plan, ideally a previous plan or timing, recent schema or data changes, and the engine. I want a systematic investigation that isolates whether the…
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