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 1syyH4-003MMS-Vw for pgsql-general@arkaria.postgresql.org; Thu, 10 Oct 2024 18:52:35 +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 1syyH3-005LzF-UJ for pgsql-general@arkaria.postgresql.org; Thu, 10 Oct 2024 18:52:34 +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 1syyH3-005Lz6-JU for pgsql-general@lists.postgresql.org; Thu, 10 Oct 2024 18:52:33 +0000 Received: from smtp98.iad3a.emailsrvr.com ([173.203.187.98]) by magus.postgresql.org with esmtps (TLS1.2) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1syyH0-000O7l-Kg for pgsql-general@lists.postgresql.org; Thu, 10 Oct 2024 18:52:33 +0000 X-Auth-ID: xof@thebuild.com Received: by smtp13.relay.iad3a.emailsrvr.com (Authenticated sender: xof-AT-thebuild.com) with ESMTPSA id 91BEC3937; Thu, 10 Oct 2024 14:52:29 -0400 (EDT) Content-Type: text/plain; charset=us-ascii Mime-Version: 1.0 (Mac OS X Mail 16.0 \(3776.700.51\)) Subject: Re: Question on indexes From: Christophe Pettus In-Reply-To: Date: Thu, 10 Oct 2024 11:51:58 -0700 Cc: pgsql-general Content-Transfer-Encoding: quoted-printable Message-Id: <56CE69DD-FFC8-45A4-8EF6-513BB011310F@thebuild.com> References: To: sud X-Mailer: Apple Mail (2.3776.700.51) X-Classification-ID: a10fe4ff-64d1-4798-832f-78ee883b62f4-1-1 List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Archived-At: Precedence: bulk > On Oct 10, 2024, at 11:49, sud wrote: >=20 > Hi, > I have never used any 'hash index' but saw documents in the past = suggesting issues around hash index , like WAL doesnt generate for "hash = index" which means we can't get the hash index back after crash also = they are not applied to replicas etc. That's very old information. Hash indexes are correctly WAL-logged = since (IIRC) version 10.=