This graphic shows the stages of SQL processing, represented as five vertical boxes linked by downward-pointing arrows: SQL Statement, Parsing, Optimization, Row Source Generation, and Execution. The Parsing box is labeled "Syntax check, Semantic check." The Optimization box is labeled "Generation of multiple execution plans." The Row Source Generation box is labeled "Generation of query plan." An arrow labeled "Soft parse" extends from the Parsing box to the Execution box.