From: Tom Lane <tgl@sss.pgh.pa.us>
To: Laszlo Nagy <gandalf@shopzeus.com>
Cc: Gregory Williamson <Gregory.Williamson@digitalglobe.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Cc: Daniel Fekete <danieleff@gmail.com>
Subject: Re: Slow table update
Date: Mon, 22 Dec 2008 08:30:22 -0500
Message-ID: <7032.1229952622@sss.pgh.pa.us> (raw)
In-Reply-To: <494F8DFC.1000001@shopzeus.com>
References: <494F749A.5090603@shopzeus.com>
<494F7B48.6070204@shopzeus.com>
<8B319E5A30FF4A48BE7EEAAF609DB233021F389A@COMAIL01.digitalglobe.com>
<494F8DFC.1000001@shopzeus.com>
Laszlo Nagy <gandalf@shopzeus.com> writes:
>> If the table has some sort of FK relations it might be being slowed by
>> the need to check a row meant to be deleted has any children.
>>
> If you look at my SQL, there is only one column to be updated. That
> column has no foreign key constraint.
That was not the question that was asked.
> My other idea was that there are so many indexes on this table, maybe
> the update is slow because of the indexes?
Updating indexes is certainly very far from being free. How many is
"many"?
regards, tom lane
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To: pgsql-performance@postgresql.org
Cc: tgl@sss.pgh.pa.us, gandalf@shopzeus.com, Gregory.Williamson@digitalglobe.com, danieleff@gmail.com
Subject: Re: Slow table update
In-Reply-To: <7032.1229952622@sss.pgh.pa.us>
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