guideline

Define arrays of records as parallel arrays when measured performance indicates.

    -- Array of records
    Process (Student (Index).Name, Student (Index).Grade);
    -- Record of arrays
    Process (Student.Name (Index), Student.Grade (Index));
    -- Parallel arrays
    Process (Name (Index), Grade (Index));

rationale

Determine the impact of structuring data as arrays of records, records containing arrays, or parallel arrays. Some implementations of Ada will show significant performance differences among these examples.