Interactive report over db_link never comes back

Hi,
I have an interactive report (over db_links) which takes 20 sec. to run in sql workshop, but it never comes back when I run it as an interactive report! I always get an error page due to timeout.
Any idea why?
Thanks.

Hi
The interactive report will change the actual SQL executed even if you have no filters, aggregations etc on. If you look at a trace file you will see COUNT OVER() and the apex max row count stuff.
As the SQL text is different, the optimizer may choose a different execution plan which affects where the different parts of the work is performed (on the local site or the external site). This can change execution times vastly.
So run a 10046 trace without the interactive report and run one with the interactive report. Once you've done this you can determine the more desirable one and think about putting a
/*+ DRIVING_SITE(table_name) */hint in the interactive report query.
Hope this helps.
Cheers
Ben
http://www.munkyben.wordpress.com
Don't forget to mark replies helpful or correct ;)

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