I've got an application that pulls stock information from the web and performs a bunch of calculations on them. There is a "stock" table and then for convenience I've got a view called "stock_calculations". This view is defined as a stock id column coupled with 30-some calculated columns. Some of these columns are computationally intense and are delegated to functions.
If I ever "select * from stock_calculations", the query is understandable pretty slow, since it has to do every one of the calculations for each stock. However, in 8.1, if I only selected a couple of specific columns from the view, it ran very quickly. I assumed that the database did not bother calculating all the other columns it didn't need.
Unfortunately, I've recently upgraded to 8.3 and found that selecting a single column from this view has now become as slow as selecting all of them.
I'm wondering if there is any thing that I can do about this short of downgrading to 8.1? Are there any configuration parameters that effect this behavior?
Thanks, Mark -- Sent via pgsql-performance mailing list (pgsql-performance@xxxxxxxxxxxxxx) To make changes to your subscription: http://www.postgresql.org/mailpref/pgsql-performance
