Optimizing Database Queries: Exploring the Heuristic and Cost-Based Approaches

I think everyone at least once used the explaincommand or at least heard about it. This command demonstrates the query execution plan, but how exactly the DBMS arrives at it remains a mystery. And how does the DBMS understand that the selected query is optimal? Does it check all possible options?

In this article, I will try to give a little idea of how query optimizers work from a theoretical point of view.

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