From: Tom Lane <tgl@sss.pgh.pa.us>
To: =?UTF-8?Q?Ulf_Lohbr=C3=BCgge?= <ulf.lohbruegge@gmail.com>
cc: Scott Marlowe <scott.marlowe@gmail.com>,
        Andres Freund <andres@anarazel.de>,
        "pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Slow execution of SET ROLE, SET search_path and RESET ROLE
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Comments: In-reply-to =?UTF-8?Q?Ulf_Lohbr=C3=BCgge?=
 <ulf.lohbruegge@gmail.com>
	message dated "Wed, 08 Nov 2017 00:04:18 +0100"
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Date: Tue, 07 Nov 2017 18:45:47 -0500
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=?UTF-8?Q?Ulf_Lohbr=C3=BCgge?= <ulf.lohbruegge@gmail.com> writes:
> I just ran "check_postgres.pl --action=bloat" and got the following output:
> ...
> Looks fine, doesn't it?

A possible explanation is that something is taking an exclusive lock
on some system catalog and holding it for a second or two.  If so,
turning on log_lock_waits might provide some useful info.

			regards, tom lane


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