Basic Steps in Query Processing 1.Parsing and translation 2.Optimization 3.Evaluation parser and relational algebra query translator expression optimizer query output evaluation engine execution plan data statistics about data Database System Concepts-5th Edition,Aug 27,2005. 13.3 ©Silberschat乜，Korth and SudarshanDatabase System Concepts - 5 13.3 ©Silberschatz, Korth and Sudarshan th Edition, Aug 27, 2005. Basic Steps in Query Processing 1. Parsing and translation 2. Optimization 3. Evaluation