Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3

From: <vincent(dot)moreau(at)leroymerlin(dot)fr>
To: vincent(dot)moreau(at)leroymerlin(dot)fr, Michael Fuhr <mike(at)fuhr(dot)org>, pgsql-performance(at)postgresql(dot)org
Subject: Re: Execution plan changed after upgrade from 7.3.9 to 8.2.3
Date: 2007-03-13 13:28:24
Message-ID: 45F6A6F8.9090405@leroymerlin.fr
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Here it is :

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

CCM=#

Alvaro Herrera wrote:
> vincent(dot)moreau(at)leroymerlin(dot)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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