I want to maximize the speed of performing calculations in related tables. I will be performing a REPLACE on every record in the child table based on values in the Parent record. Any thoughts on the best performers ?

1) Using Set Relation to 'automate' finding records in child tables

2) Using Set Filter to 'manually' SKIP thru records in child tables based on Parent key.

3) Using Scan For in child table based on Parent key.

4) Using good old fashion Seek in the Child table based on Parent key.