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Computers play an important role in every aspect of life, used to store and retrieve data that has large numbers in an efficient manner, usually called the managemet database systems (DBMS). Facilities of the DBMS is able to access a single databasesimultaneously by many users, can access data in a confined onlyto the user who has the right and replace the failure of the systemswithout losing data integrity. Generally, the first interface (tree) to aDMBS is a high-level query or data manipulation language. An example is SQL (Structure Query Language). Reliability of a database system or the DBMS can be detected by the optimizer works his way in the processing of SQL statements, statement made by the user and application programs. In the optimizer, statement-statement that is processed by one of the many available methods for obtaining the most optimal query plan will ultimately be up to answer queries with the minimum accesstime. The process of finding the best query execution plan is called the query optimization process.
Keywords : query, database My-SQL
