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After a summative exam staff will go into the Class Totals report. This checks to see if caching is needed - if cached date is in place for the current paper and the exam has finished. If caching is needed then the class_totals.class.php object will write into three tables:
| cache_median_question_marks | Holds the mean and median performance of a question on a particular paper. |
| cache_paper_stats | Holds statistics of the performance of a paper. Used in the Performance Summary reports. |
| cache_student_paper_marks | Holds student marks/percent by paper. Used in the Performance Summary reports. |
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