Re: performance problems on Delete

From: Silvio Brandani <silvio(dot)brandani(at)tech(dot)sdb(dot)it>
To: Kevin Grittner <Kevin(dot)Grittner(at)wicourts(dot)gov>
Cc: pgsql-admin(at)postgresql(dot)org
Subject: Re: performance problems on Delete
Date: 2010-08-03 11:41:50
Message-ID: 4C58007E.4010909@tech.sdb.it
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Kevin Grittner ha scritto:
> Silvio Brandani wrote:
>
>
>> we have a performance issue on deleting data from a table.
>>
>> the delete is on the index key so should be very fast but the table
>> have 13 contraints of type foreign keys and the slowness seems due
>> to all the works done with the constraint.
>> Trying to drop the constraint and execute the delete the result is
>> immediate.
>>
>
> The usual reason for this is that you don't have indexes on the
> referencing columns, so to check whether the delete is OK it has to
> scan the related tables. Think about what rows need to be checked to
> determine whether the delete is allowed and index the columns which
> will allow fast access to them.
>
> -Kevin
>
>
yes,
you where right , an index was missing.

thanks a lot

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