Thread:Talk:Semantic Result Formats/Charting over 1000 data points

I'm certainly unlucky, but I've yet to succeed once in creating a semantic graph. For example failures of the simple histogram kind, see and.

I've tried many tweaks by following docs for different formats and suggestions by Special:Ask itself, but the outcome is always the same:
 * 1) either a graph is shown based on a random subset of the data points (i.e. completely false);
 * 2) or no graph is shown at all (sometimes a helpful message "The chart or graph is empty due to missing data" is shown instead).

Now, I understand there is a limit in how resource-intensive a graph can be, but the docs (here or on mw.o) don't even mention this error at all. Example questions I'd like the docs to answer:
 * 1) how many data points you can reasonably expect to succeed in charting;
 * 2) whether increasing the semantic results limit in wiki configuration helps, or any other configuration tweak is possible;
 * 3) if some of the chart formats is more likely to succeed;
 * 4) whether I can exclude there are errors in my query where the same query succeeds in other formats (e.g. standard count or list);
 * 5) if there is some way to optimise the queries so that some data is sent to the format;
 * 6) how to make the chart display some error or footnote or whatever when some data was skipped;
 * 7) how to break down a chart in multiple charts which don't fail.