Received: from malur.postgresql.org ([2a02:16a8:dc51::56]) by arkaria.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1g3A2F-0001YC-3d for pgsql-committers@arkaria.postgresql.org; Fri, 21 Sep 2018 01:15:07 +0000 Received: from localhost ([127.0.0.1] helo=malur.postgresql.org) by malur.postgresql.org with esmtp (Exim 4.89) (envelope-from ) id 1g3A2C-0001BP-Dl for pgsql-committers@arkaria.postgresql.org; Fri, 21 Sep 2018 01:15:04 +0000 Received: from magus.postgresql.org ([2a02:c0:301:0:ffff::29]) by malur.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1g3A2C-0001BI-8E for pgsql-committers@lists.postgresql.org; Fri, 21 Sep 2018 01:15:04 +0000 Received: from mail.thelabyrinth.net ([45.56.70.56]) by magus.postgresql.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_CBC_SHA384:256) (Exim 4.89) (envelope-from ) id 1g3A24-0004JQ-Pz for pgsql-committers@postgresql.org; Fri, 21 Sep 2018 01:15:03 +0000 Received: from Davids-iMac.local (c-73-39-99-224.hsd1.de.comcast.net [73.39.99.224]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: dsteele) by mail.thelabyrinth.net (Postfix) with ESMTPSA id 5B0B354661; Fri, 21 Sep 2018 01:14:53 +0000 (UTC) Subject: Re: pgsql: Make WAL segment size configurable at initdb time. To: Michael Paquier Cc: Andres Freund , pgsql-committers@postgresql.org References: <68ea97d6-2ed9-f339-e57d-ab3a33caf3b1@pgmasters.net> <20180920235932.GD1338@paquier.xyz> From: David Steele Openpgp: preference=signencrypt Autocrypt: addr=david@pgmasters.net; prefer-encrypt=mutual; keydata= xsFNBFSheh0BEADGNb3c1kOaX5OGUDhqHTwJ3JW7XAllfWLdknpRg+/fihgLPPRnQHZhjq28 nmMLqM+C8TjezT2BgVACeu8qqASnuzN/E5+bAl9hVcgCP4eV/lEIWwVxmhcHqSdeWqWZSBRB tf07fLBnz22+3LwVsESN+fanWxnoqqvE0+hyGnCEDhOBkihgbYHuq4vw1+xgoGN1uDk4NShV El0ZWO90P4e5mOWA2Zsex+8YhGJlfRwMpU69okFCvjpWJKE+ufeJdlrxEpSSKW7SQ0kG1VF7 CvDKpF70TCWkb4Bagb6c7lwZrMjxuBnlIvOlV3RRY67PAaVIFRRvQJeJABOPHp8HnH8cwici 7gwwfWBrZZeAdPqs6VNjANqI9uaDasRnD3yHP6CcHIAeCl5hYnzNTkIqBRlnmD5y8s0VRDLr 6JR3FxscOsvwXPJ+He1RpRlxQDlBboaRFUz8endeQHhGUeHyekQcSYUaz4PX3OJBG0Xi7nr8 EOP6zOeP61z3dL8NuO3QjgPiygvS0qwMEPvOYo52nEGYn08nvFVajI8yxOXFnIwnmpgr5gdq nL9ga72tvSyJQAUx+YB7r1bKjRn/Mlt/fPIS5PXONofiO1K8uX+pzvIX6dnm7ihpFf1XC+uG 5+DKBnU7yS7jCRL52GxWHbuC3mT4tvzqH2b13TLng1Y7Izi+hwARAQABzSJEYXZpZCBTdGVl bGUgPGRhdmlkQHBnbWFzdGVycy5uZXQ+wsF5BBMBCAAjAhsDAh4BAheABQsJCAcDBRUKCQgL BBYCAwEFAlShuEECGQEACgkQn830JKJznPPsLhAAtKkIu0mFfxcVqApg4PNjZKYY4TWeN+I+ go/VKX8QWMadr33t8Sxcgyn48bjBYzgWQXhF4rMcFxDxI3ly5bdE8QKZkhFJJT7N2fBoo9Zm ZOsOvPd+5hz07VZpgNSiTXMAphj8+GSTLbYufm/OUnfpS1eovPtPdYPQpNC3RVHA0gtisz26 NgMLg6QN0iQuITs9N+wiaGtyVIornl4XAY2dM/Hvfr1aDFkukNNr52sc/mGqocG/dKC7dONA 3860y2MLszQcbAE45iEkmwpGkvxyc3i3tvdD3VNlVI1MKJUBnxFPUEI0lVq5WpApFSIU31+j aNunKIcfVxRnM8FTJBsw3RnFRpSsEtiLaZRm5sOZHa9+dy/DWDb+8O1I+momCo88+Jksd6pZ 2Tz9msOiJiTnFsCZgfbbmayH6w8ZyfHuO0DuxScM1UK+6CLC2VVjQFuH6WHqJpaENg5INswS qpUc05iC4i+6dZOe44cviX6LpHuP8vWM0E63CMun0l42yHWy+k6nLvx/fj7t++tF2JIJ92OG n/2MkM5lIKknRg27UjYAspD6f3NSZUMIe6tGyWPTtLOu8zOL5CeRyCHMWwUVDKJSBzlK2mV8 e0EbmtUJFsoNWXWKPKUIxX7JXPN3v523HmOhtyz5SnkGtwEqCZiv/JccYmh+S2IokAuscLNP EJrOwU0EVKF6HQEQALPpUsP67xfcj6NUMyySXSytUzMIVi5XNTyazuNcVfFZzT9QL8wFQkgy i/HOD3tmvdGxz6H8V+v+cszp88gCd8TwClss7u+iPsLlAQQWC4q0WiX4OhwFv2H004iuft8i odjiWDkYEgIFxlPNxQfHFmchkyODIJXQmnzbgsXwGZtJzAxEVh6AgYJqE/Ev/+kTJhJ7703n oIb+PXvafoB5axnU4nf7DuFa9X+q2/ZfzyAXUCKvzDvxb24iUgWFzlWBx0CnI21Kh6aS6hR6 o00D2OBiU+yCpW9eRTi3SuDuslmtCUaZz5V4SHo37ochEYfZ2LYOPsBO3PUMx8T7MDYrmv/x 4W5rdjugz4NXWROStNNLpS74LW20rdrEKMDltph7U2zfjjS663K+CUxoXn/ha2WnzBocoY5o KwdViLln4s0ivOTa4clHJJUsYiAxLShAe2AP+5kJim24tAabbEOsrRTn9RpT7J8jVT/G0YDE glujEt0U04Akkj5NO4G7vJP/AyX5zKZetkp/HFiFBZMkUuXD/KgDc5EM2fpQtaxGGY2fcQqY VHUbbxstxyl5d349M9rok7O90hw9BkP0Q8UEpgmlZ6ftwx+ZfZmBEdQ7HcMHnSPSNJkXt/Vi ozlcrSnkVXzCXvH9DHrIpgenp8btsJ2XyjSdrEu4jAqYeirW+3qRABEBAAHCwV8EGAEIAAkF AlSheh0CGwwACgkQn830JKJznPNmERAApYaQK6i9F6hM2RUD/PqQC45WmzOXK9bDSS9hdk4p Nc5jSW2+FkcMFe1XFG2NyGf1v5KBPxuDTQp35PIwRsL59xNmPICu0ae6zmCPUpxbMIEzb/VU wXqeuNp3cRVll06goDt5w+2LlAtBrxuDjiWxby9LH+vsIUMLWYu+M50pdtOcXOsO1+zyfs3w U6xRZ3PaFDKO1cB68okDFG/cFHnYfY5aETV7LgVBHEOQLwL01U01QC/iqY/aNO4iUH/+PBc0 R6mYlP7IqDQOQVTJ0dXP365thl0Q7c9e2JQSS9wuSv2EEiR//nnZREtLyrQNLwsXE8UFBDe7 uA8Lm2ldmQYpHHKAcorGVTHYJaaus2LjH8tZ1i4RGg4hKMJSHil/5C+Ghl+PmcACVeGaxB0c mJ8+0jyWDkLCDMAXJJyvXRWIONTAxVt5kKg1/iMAq1IQYNd66agnmgxdSvKLPUo0JJ5fhQJp 2bqDDTrINTZg+Rub2HeoOMxYJsMypK+6aY4iVlm2Z7A9SgyQDjGAXzD9+XaezNFeXxfPbjo6 46qA9SycdYhiwaTcTQakiLkZWRIkSjGQwNCK9NktE1fYnXfR0+WaWFduQ4BfM5uta1bt8esB /mLEjVYS9RRAWZ/untJrR9JYGTC4Mu6tcLGZD7385yX3TNM1iaIUGxlKkHHCZCnILyo= Message-ID: <4b5568f5-72b7-5355-3450-973e11447569@pgmasters.net> Date: Thu, 20 Sep 2018 21:14:51 -0400 User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.13; rv:52.0) Gecko/20100101 Thunderbird/52.9.1 MIME-Version: 1.0 In-Reply-To: <20180920235932.GD1338@paquier.xyz> Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="A7LynpHCwo8yn0MjzjyytAzmI29QAKP5s" List-Id: List-Help: List-Subscribe: List-Post: List-Owner: List-Archive: Precedence: bulk This is an OpenPGP/MIME signed message (RFC 4880 and 3156) --A7LynpHCwo8yn0MjzjyytAzmI29QAKP5s Content-Type: multipart/mixed; boundary="Yj1E3ubzr4Fr7ymnTW4s4cnGrqgN1ASdH"; protected-headers="v1" From: David Steele To: Michael Paquier Cc: Andres Freund , pgsql-committers@postgresql.org Message-ID: <4b5568f5-72b7-5355-3450-973e11447569@pgmasters.net> Subject: Re: pgsql: Make WAL segment size configurable at initdb time. References: <68ea97d6-2ed9-f339-e57d-ab3a33caf3b1@pgmasters.net> <20180920235932.GD1338@paquier.xyz> In-Reply-To: <20180920235932.GD1338@paquier.xyz> --Yj1E3ubzr4Fr7ymnTW4s4cnGrqgN1ASdH Content-Type: text/plain; charset=windows-1252 Content-Language: en-US Content-Transfer-Encoding: quoted-printable On 9/20/18 7:59 PM, Michael Paquier wrote: > On Thu, Sep 20, 2018 at 11:48:08AM -0400, David Steele wrote: >> >> >> >> - Reports the number of blocks (pages) in a WAL segment file. >> - The total size of a WAL segment file in bytes is equal to >> - wal_segment_size multiplied by wa= l_block_size; >> - by default this is 16MB. See for >> + Reports the size of write ahead log segments. >> + The default value is 16MB. See for >> more information. >> >> >=20 > The GUC wal_segment_size reports as well 16MB in v10 or older versions,= > so shouldn't the mention to wal_block_size be removed even further down= ? Oddly, the GUC reports 16GB on `show wal_segment_size` but you get 2048 when querying pg_settings. I thought that was just the normal behavior for older versions -- and it might be a problem to change it. --=20 -David david@pgmasters.net --Yj1E3ubzr4Fr7ymnTW4s4cnGrqgN1ASdH-- --A7LynpHCwo8yn0MjzjyytAzmI29QAKP5s Content-Type: application/pgp-signature; name="signature.asc" Content-Description: OpenPGP digital signature Content-Disposition: attachment; filename="signature.asc" -----BEGIN PGP SIGNATURE----- Comment: GPGTools - https://gpgtools.org iQIzBAEBCgAdFiEEDkRHqfbjxwCMp7jigDa4glDlIUAFAlukRgwACgkQgDa4glDl IUAMHg/9Eff11zmxA+1MIVYFlWsi6G2OwWQq5/RDRpRWd2pKSEEQdTHt795yhyXT 0H5QX/uXU7CViFQFf/UEY9Rty16gc7EzwS1pxhW+x6fOxvM1ziWvKatvf1YWJgSn 4qCDCy78dWmMF7adwZCzWTKlgAkgy6aYWmjELERgKHtFvuxyCaLjCo51C2meWP2K UFNkBtVfUjAWlD0CUWov/3lvt9P8LCNJFJ+XP6vxESwZsvzwUXGRboGf3p8qRmQg dEekvCvi7IfbHLHuPv+wWW468l083ppn3oG+o1mKuYSWx/4cW3aobD3vubV8bHgs w+cporXOKNXZTCI3GK/iId2WhhPmVVhK8onKX5IN2nz3VHM6NS/Tie7Jd0sZpX5h Mhrud69MzQ5O0OKzDGLi7cMn4smByqvmxwVxC4i9pK05YY+dCNXMN/QcaHNADYRV PuOf3QfBUCgDjAB+FJv3YLPU7SWFxcb71y9pK/MTm62fy/OhYEXztVc4M0+5EfaF lyjE8So0Gilu99M3bQjTjklUBR1FlIqdmor1u8au1BO9/Y69Hedg7ZdAESXQNqIJ Ddb6NhJcqUtEtKzBB4Ww8GWd0V20FzJ7WkNAwYlHvDOGUkNYNG2uzkm6/K3R+bE3 2qu17u/hLLJLI05IZNdZCwLAbSUiovDauwNqpJZMOQxNyRxSgDI= =fj43 -----END PGP SIGNATURE----- --A7LynpHCwo8yn0MjzjyytAzmI29QAKP5s--