... on Database Systems, Vol. 13, No. 1, March 1933. Physical Database Design for Relational Databases l 93 -the workload on a database changes substantially, -new tables are added, -the database ... application of these valid methods. ACM Transactions on Database Systems, Vol. 13, No. 1, March 1988. Physical Database Design for Rdational Databases - 101 calculated each C, (aI, (Ye, . . . , ... described in the previous section. ACM Transactions on Database Systems, Vol. 13, No. 1, March 1988. Physical Database Design for Relational Databases . 123 WEIGHT WORKLOAD STATEMENTS 5 5...