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 |
Views: | Raw Message | Whole Thread | Download mbox | Resend email |
Thread: | |
Lists: | pgsql-admin |
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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