関連ワード:  what is optimization in dbms    what is query optimization in dbms    what is heuristic optimization in dbms    what is query optimization in dbms with example    what is cost based optimization in dbms    what is heuristic based optimization in dbms    what is query processing and optimization in dbms    what is query optimization in dbms in hindi    what is query optimization techniques in dbms    what is the importance of query optimization in dbms