Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3 - Mailing list pgsql-performance

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Subject Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3
Date
Msg-id 45F6A6F8.9090405@leroymerlin.fr
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In response to Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3  (Alvaro Herrera <alvherre@commandprompt.com>)
Responses Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3
List pgsql-performance
Here it is :

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

CCM=#




Alvaro Herrera wrote:
> 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.
>
>


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