Re: Known Bottlenecks

On Mon, Oct 19, 2009 at 2:43 PM, Vikul Khosla <vkhosla(at)gridsolv(dot)com> wrote:

> 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.
>

other one would be SELECT .. WHERE foo IN (SELECT ...); (use join instead,
and in case of NOT IN , use left join).

--
GJ