[Koha-bugs] [Bug 23626] New: Add a system preference to limit the number of rows of data used in a chart when viewing report results

[bugzilla-daemon at bugs.koha-community.org]

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23626

            Bug ID: 23626
           Summary: Add a system preference to limit the number of rows of
                    data used in a chart when viewing report results
 Change sponsored?: ---
           Product: Koha
           Version: master
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: P5 - low
         Component: Reports
          Assignee: koha-bugs at lists.koha-community.org
          Reporter: paul at flo.org
        QA Contact: testopia at bugs.koha-community.org
        Depends on: 23624

Created attachment 92845
  -->
https://bugs.koha-community.org/bugzilla3/attachment.cgi?id=92845&action=edit
New syspref ReportsMaxRowsInChart

The number of rows generated by a report is potentially unlimited; this has the
potential to exhaust all available memory, bringing a Koha server down to its
knees.

The attached patch introduces a system preference to limit the number of rows
used when charting report results; at this time, and with bug #23624 fixed,
that is the only aspect of reporting that loads all results into memory at
once.


Referenced Bugs:

https://bugs.koha-community.org/bugzilla3/show_bug.cgi?id=23624
[Bug 23624] Count rows in report without (potentially) consuming all memory
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