Re: pgaudit and create postgis extension logs a lot inserts

From: David Steele <david(at)pgmasters(dot)net>
To: Magnus Hagander <magnus(at)hagander(dot)net>, Joe Conway <mail(at)joeconway(dot)com>
Cc: Svensson Peter <peter(dot)svensson(at)smhi(dot)se>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Subject: Re: pgaudit and create postgis extension logs a lot inserts
Date: 2018-01-19 13:41:42
Message-ID: d3351319-a6bb-6bf8-2d2b-7bcd0b731ea0@pgmasters.net
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On 1/19/18 6:05 AM, Magnus Hagander wrote:
>
>
> On Thu, Jan 18, 2018 at 6:54 PM, Joe Conway <mail(at)joeconway(dot)com
> <mailto:mail(at)joeconway(dot)com>> wrote:
>
> On 01/18/2018 04:12 AM, Svensson Peter wrote:
> > When I then install  postgis extension in a database it writes a huge
> > amount of logs which slow down the server a lot.
> > Not only table creation and functions are logged,  even  all inserts in 
> > spatial_ref_sys are written to the audit-log.
> >
> > LOG:  AUDIT: SESSION,1,1,DDL,CREATE FUNCTION,,,"
> > ......
> > INSERT INTO ""spatial_ref_sys"" (""srid"",""auth_name"
> > ....
> >
> > This behaviour make pgaudit useless in our environment due to the
> > overhead in log-file write.
>
> How often do you intend to install PostGIS? Disable pgaudit, install
> PostGIS, enable pgaudit?
>
>
> Would it make sense for pgaudit to, at least by option, not include DDL
> statements that are generated as "sub-parts" of a CREATE EXTENSION? It
> should still log the CREATE EXTENSION of course, but not necessarily all
> the contents of it, since that's actually defined in the extension
> itself already?
That's doable, but I think it could be abused if it was always on and
installing extensions is generally not a daily activity.

It seems in this case the best action is to disable pgaudit before
installing postgis or install postgis first.

Regards,
--
-David
david(at)pgmasters(dot)net

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