Query Processing Components Query language that is used SQL ( Structured Query Language) Query execution methodology the steps that the system goes through in executing high-level (declarative)user queries Query optimization How to determine the best execution plan?4 Query Processing Components Query language that is used  SQL (Structured Query Language) Query execution methodology  The steps that the system goes through in executing high-level (declarative) user queries Query optimization  How to determine the “best” execution plan?