A relational query optimizer is an expert system within a relational DBMS.

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A relational query optimizer is a component within a relational DBMS that analyzes a SQL statement and generates an execution plan that will retrieve the requested data with the most efficient use of system resources. It is designed to improve the overall performance of the database system by optimizing query execution. It uses various algorithms and heuristics to determine the best plan for executing a given query.

A Relational Query Optimizer Is an Expert System Within a Relational