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From: Tom Lane <tgl@sss.pgh.pa.us>
To: Andres Freund <andres@anarazel.de>
cc: "Mkrtchyan, Tigran" <tigran.mkrtchyan@desy.de>,
 pgsql-performance <pgsql-performance@postgresql.org>
Subject: Re: 9.5alpha1 vs 9.4
In-reply-to: <20150705125403.GD24494@alap3.anarazel.de>
References: <1897514812.2949286.1436094651680.JavaMail.zimbra@desy.de>
 <20150705125403.GD24494@alap3.anarazel.de>
Comments: In-reply-to Andres Freund <andres@anarazel.de>
 message dated "Sun, 05 Jul 2015 14:54:03 +0200"
Date: Sun, 05 Jul 2015 10:33:25 -0400
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Andres Freund <andres@anarazel.de> writes:
> On 2015-07-05 13:10:51 +0200, Mkrtchyan, Tigran wrote:
>> today I have update my test system to 9.5alpha1.
>> Most of the operations are ok, except delete.
>> I get ~1000 times slower!

>> 255.88 |          566.11 |   452 | DELETE FROM t_inodes WHERE ipnfsid=$1 AND inlink = ?

> That certainly should not be the case. Could you show the query plan for
> this statement in both versions?

EXPLAIN ANALYZE, please.  I'm wondering about a missing index on some
foreign-key-involved column.  That would show up as excessive time in
the relevant trigger ...

			regards, tom lane


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