Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3

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Here it is :

CCM=# SHOW enable_mergejoin;
enable_mergejoin
------------------
on
(1 row)

CCM=#




Alvaro Herrera wrote:
> vincent.moreau@xxxxxxxxxxxxxx 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.
>
>   


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