How to speed up Reports / Charts in Application Express?

Very often I get a request to generate an analysis similar to an excel sheet. And, as it is usual with excel, it should contain a table and a chart showing some aggregated information. In the most of the cases, the information displayed in the table has the same source as the information displayed in the chart. The problem occurs then, where there are multiple series in a chart. Depending on the size of the tables, it could take minutes to generate such a report - the same query needs to be run several times, first for the report and then for each series in the chart. Just recently, I had a requirement to create someting like that and it would take two minutes to display a page like this one here:
http://htmldb.oracle.com/pls/otn/f?p=31517:37
The problem is that user needs to query multiple combinations of sales representatives and in that case it would take a long time. On the page I provided the link to, the charts
and the report are created at almost the same time. The trick is the following:
1. Instead of using creating a separate queries for each series in the chart and report, I
used collections,
2. the collection is getting populated in one single run
3. both, the table and the charts are generated from the collection
This way, I was able to bring the reporting time to a minimum.
Denes Kubicek

See the login page of my demo application. Everything you need is explained there.
Denes Kubicek
http://deneskubicek.blogspot.com/
http://www.opal-consulting.de/training
http://apex.oracle.com/pls/otn/f?p=31517:1
http://www.amazon.de/Oracle-APEX-XE-Praxis/dp/3826655494
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