Annotation of loncom/html/adm/help/tex/Statistics_Cache.tex, revision 1.2
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
1.2 ! matthew 26: use.
! 27:
! 28: \textbf{Clear Caches} causes the entire cache for the course to
1.1 matthew 29: be flushed, discarding all the current contents. The cache is then
30: rebuilt to display the desired statistics. The normal use of
31: statistics should not require you to press this button, but it is here
32: for completeness.
33:
34: \textbf{Update Caches} checks the students record for updates since their
35: data was compiled. Any changes to the student's record for your
36: course will be reflected after this button has been pressed. The
37: \textbf{Update Caches} button is useful if your students are currently
38: completing a homework set and you wish to evaluate their progress in
39: the time your statistics were generated.
40:
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