Received: from malur.postgresql.org ([217.196.149.56]) by arkaria.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1uoh6D-008OB0-VK for pgsql-general@arkaria.postgresql.org; Wed, 20 Aug 2025 11:35:27 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.94.2) (envelope-from ) id 1uoh6D-007fKD-ES for pgsql-general@arkaria.postgresql.org; Wed, 20 Aug 2025 11:35:26 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1uoh6D-007fK5-4B for pgsql-general@lists.postgresql.org; Wed, 20 Aug 2025 11:35:25 +0000 Received: from lana.depesz.com ([88.198.49.178] helo=depesz.com) by magus.postgresql.org with esmtps (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.96) (envelope-from ) id 1uoh6B-000tq2-21 for pgsql-general@lists.postgresql.org; Wed, 20 Aug 2025 11:35:25 +0000 DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=depesz.com; s=20170201; h=In-Reply-To:Content-Type:MIME-Version:References:Reply-To: Message-ID:Subject:Cc:To:Sender:From:Date:Content-Transfer-Encoding: Content-ID:Content-Description; bh=AorJAddC1Cxunw344ysUjnIJu/rSB69KGOgDpGHVOPA=; b=jbBwZiTSyUipAYMYDMhYygm0uM qrAEliF3K7M8OoguQTetl7JORhxWDukPUk4KH+sZA2fiDyQRJIvIxuN5OJ6DHmA3q4vOuYp90qwH2 MCzNNB+24TyC2nXKoNOQa8u9yZjyowWhVm21gWiBnDkQAb9wUj8mmSQmqCPqxs9QKxmU=; Received: from depesz by depesz.com with local (Exim 4.96) (envelope-from ) id 1uoh68-00Chzi-1b; Wed, 20 Aug 2025 13:35:20 +0200 Date: Wed, 20 Aug 2025 13:35:20 +0200 From: hubert depesz lubaczewski Sender: depesz@depesz.com To: Scot Kreienkamp Cc: Adrian Klaver , PostgreSQL General Subject: Re: Streaming replica hangs periodically for ~ 1 second - how to diagnose/debug Message-ID: Reply-To: depesz@depesz.com References: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Disposition: inline In-Reply-To: List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk On Tue, Aug 19, 2025 at 08:25:26PM +0000, Scot Kreienkamp wrote: > Synchronous commit? Or asynchronous? Isn't this potential problem on primary, and not replica? Anyway, synchronous commit is set to "on", and "synchronous_standby_names" is empty. Best regards, depesz