6. The DBMS of claim 5 , the compiler is further to perform another estimated cost comparison between an estimated resource execution cost of the modified query plan and the cost rules.
6. The DBMS of claim 5 , the compiler is further to perform another estimated cost comparison between an estimated resource execution cost of the modified query plan and the cost rules. 7. The DBMS of claim 6 , wherein the compiler is further to prevent the modified query plan from executing based on results of the another estimated cost comparison.