Hi Alex, Thank you. I played with subqueries, but in this case I did not see a good enough improvement.
In my specific case, what I've seen from the query execution plans, is that without LIMIT the query uses Hash Joins, but once I add LIMIT, it starts using Nested Loop Joins almost everywhere. Regards, Andrew On Wed, Feb 1, 2012 at 9:42 PM, Alex Lai <a...@sesda2.com> wrote: > Hi Andrew, > I posted for another post, its may give you a workaround. > I still not fully understand how PG choose execute plan that slow down so > much. > > I had the same situation in one of my query. > Use the subquery can speed up almost by 100 times faster. > > .......... > > Hope this help. > > > Best Regards, > Alex Lai > > -- > Best regards, > > > Alex Lai > OMI SIPS DBA ADNET Systems , Inc. 7515 Mission Drive, Suite A100 Lanham, > MD 20706 301-352-4657 (phone) 301-352-0437 (fax) a...@sesda2.com > > -- -- Andrew Schetinin
