Your Database Doesn’t Know Your Data. It Guesses. (SQL Cost Explained)
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Your Database Doesn’t Know Your Data. It Guesses. (SQL Cost Explained)
Your SQL query can be correct… and still be slow in production. Because the database doesn’t “know” your data. It estimates query cost using statistics and then picks a plan: index scan or full table scan. In this episode, you’ll learn: WHY the Query Optimizer can ignore a correct index HOW it “guesses” rows, CPU, and disk cost ...
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