<ul><li>An execution plan (sometimes called a query plan) shows how the database engine will (or did) execute a SQL query.</li><li>Execution plans provide information on steps involved in retrieving data, such as indexes used, table joins, sorting, and more.</li><li>Interpreting execution plans helps in diagnosing query problems and guiding performance optimizations.</li><li>Understanding execution plans is a fundamental skill in SQL performance tuning.</li></ul>

SQL Performance Tuning Scenario #1: Understanding Execution Plans

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