Known Bottlenecks - Mailing list pgsql-performance

Jeff, Robert, I am still working on the "low cardinality" info you requested. Please bear with me.

In the meantime, have the following question:

Are there known "scenarios" where certain types of SQL queries perform worse in PG
than they do in ORacle ?

For example, I have observed some discussion where MAX (In Oracle) was replaced with ORDER/DESC/LIMIT
in PG.

I realize this is a loaded question, but it would be great if any of you would share some observed
generalities in this context.

Thanks
VK