[Phpmyadmin-devel] Realtime charting

[Michal Čihař]

Hi

Dne Tue, 31 May 2011 00:12:31 +0200
Tyron Madlener <tyronx at gmail.com> napsal(a):

> I've added now a first version of my planned realtime charting on the
> status page in the 'Query statistics'-Tab (click on "Realtime chart").
> You can check it out at http://demo.phpmyadmin.net/gsoc-tyron
> 
> Currently it aggregates the average queries per second by making an
> ajax request every 2-2.5 seconds (2 seconds + time for one ajax
> request). Since it is using the differential of the status var
> 'questions' it takes some seconds to display a line.
> 
> For the chart I'm currently using Highcharts because it allows
> realtime data, animates beautifully, is really small (1 file, 77kb
> minified) and has a export to png/pdf/jpg plugin (6.4kb minified)
> which however uses a highcharts.com server for the conversion.

Depending on external service is not something I would like to see.

> Some radical suggestion in this regard: What about removing the
> included pChart and instead using a client-side charting library? I
> know for some part its bad since a student wrote a whole lot of code
> for it just last year, but looking at some requirements for phpmyadmin
> (no file storage, limited possibilities for data recording,
> panning/zooming, realtime updates) a server-side charting library
> offers much less possibilities compared to a client side-one. And if
> we'd use highcharts it would save us like 16 files and 750kb (well
> most of it is that dejavu font).
> I think it would be pretty easy to replace actually. Instead of the
> graph, the server-code would just need to send the already generated
> chart data hidden in the document and then we add a bit of js code to
> display the chart. Some code from chart.lib.php is probably reusable.

There has been lot of discussion what to use and we stick with sever
side solution because it did allow saving of the images (what might
be not that useful for server stats, while is definitely useful when
drawing chart from query results) and does not require javascript
(though this is less and less important nowadays).

However for realtime charts, server side solution will indeed
perform worse. And there is also need for some client side graphics
library for spatial extensions, so I'd like to see one client side
library used for both drawing spatial data and for charting.

Whether it will be possible to replace pChart or not later, that's IMHO
different question (mostly depending on usable way of exporting charts
out of client side solution).

-- 
	Michal Čihař | http://cihar.com | http://blog.cihar.com
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