Annotation of loncom/html/adm/help/tex/Statistics_Cache.tex, revision 1.1
1.1 ! matthew 1: \label{Statistics_Cache}
! 2:
! 3: The \textbf{\index{Statistics Cache}Statistics Cache} manages the data
! 4: used in computing student performance statistics.
! 5:
! 6: Much of the time spent computing statistics is actually used to
! 7: compile student data into a more useful format, the temporary course
! 8: cache. Normally student data is maintained in an archived format
! 9: which does not provide for rapid access. Since each student's data is
! 10: stored on their home server in their account, and not with the course,
! 11: it takes time to compile the data and store it in the temporary course
! 12: cache. All of the statistics modes use the same cache so the process
! 13: of compiling the student data does not need to be repeated when
! 14: successive statistics are requested.
! 15:
! 16: Only those students who are involved in the current calculation will
! 17: have their data compiled. When you modify the selected set of
! 18: students, by changing the section you are computing statistics with,
! 19: the caches will be updated.
! 20:
! 21: The temporary course cache is maintained for 2 days on the server used
! 22: for the statistics computation.
! 23:
! 24: The cache management buttons, marked \textbf{Clear Caches} and
! 25: \textbf{Update Caches}, appear when the temporary course caches are in
! 26: use. \textbf{Clear Caches} causes the entire cache for the course to
! 27: be flushed, discarding all the current contents. The cache is then
! 28: rebuilt to display the desired statistics. The normal use of
! 29: statistics should not require you to press this button, but it is here
! 30: for completeness.
! 31:
! 32: \textbf{Update Caches} checks the students record for updates since their
! 33: data was compiled. Any changes to the student's record for your
! 34: course will be reflected after this button has been pressed. The
! 35: \textbf{Update Caches} button is useful if your students are currently
! 36: completing a homework set and you wish to evaluate their progress in
! 37: the time your statistics were generated.
! 38:
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