Re: Realtime Query Dashboard Results

On Fri, Jan 7, 2011 at 5:21 PM, Oliver Kohll - Mailing Lists <
oliver(dot)lists(at)gtwm(dot)co(dot)uk> wrote:

> Charts are updated once a day overnight, or cached whenever someone looks
> at them in the system underlying the dashboard, so they are at most one day
> old. A chart is also updated when a user clicks on it to drill down to the
> data.
>
> Of course what you decide depends on what the business use case is and what
> demands there are on the system. In my cases so far the slowest charts take
> 1 or 2 seconds to generate by SQL so if necessary, each could be loaded in
> in real time over AJAX, though that hasn't been needed yet.
>

We found for our use case that customers don't like "1 day old" reports.
We've moved much of our dashboard statistics to trigger-based materialized
view, so whenever they reload, they get current numbers and the cost to
compute those numbers has already been amortized over the metric-gazillion
updates and inserts that comprise them. :) Computing them on-the-fly is
just too time consuming and people don't like to wait, either.