Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3

vincent.moreau@leroymerlin.fr wrote:
> I have attached the requested information.
> 
> You will see that the query is quite messy and could be easily improved.
> Unfortunately, it came from a third party application and we do not have 
> access to the source code.

There are only nested loops and hash joins, while the other plan seems
to be more elaborate -- I wonder if you have disabled bitmap scan, merge
joins, in 8.2?   Try a SHOW enable_mergejoin in psql.

-- 
Alvaro Herrera                                http://www.CommandPrompt.com/
The PostgreSQL Company - Command Prompt, Inc.