Guten Tag Thorsten Schöning, am Dienstag, 9. Februar 2021 um 10:56 schrieben Sie: > Any explanation for the increased dump size? Thanks! While I don't have a detailed explanation myself, there's the following hint [in the docs][1]: > For the custom archive format, this specifies compression of > individual table-data segments[...] https://www.postgresql.org/docs/10/app-pgdump.html I've changed the layout of my tables entirely and most likely have changed the "individual table-data segments" as well. So I did some further testing and got the following numbers. It's always OLD vs. NEW schema for the schema documented earlier: > --compress=0: 25 vs. 20 GiB > --compress=?: 5,6 vs. 6,5 GiB > --compress=9: 5,5 vs. 6,4 GiB "?" means default settings, meaning "--compress" has been REMOVED from the shell command. As can be seen, pretty much as soon as compression comes into play, the new table layout is less efficient, even though in OLD and NEW schema exactly the same "bytea" were used, have been placed at the end of their individual tables and alike. But things become more interesting with another version of my schema, which as well indicates a strong relationship of dump size, compression and table layout/size. I've changed the new table "datagram" to be a partitioned one with partitions containing rows per year and per half-year. Each partition contains far less rows than before this way and while I only tested with "--compress=9" this time, the numbers are quite interesting: > unpartitioned: 6,4 GiB > half-yearly parts: 4,8 GiB > yearly parts: 4,8 GiB The interesting part this time is that the table layout for all partitions is the same like before, only the number of rows per table is different. Though, the number of rows overall is the same like before, the same data, IDs etc. Though, this time the dump really is smaller than with the OLD schema containing far more data because of duplicate IDs and stuff. I wouldn't have expected table layout to be that important. Mit freundlichen Grüßen Thorsten Schöning -- Thorsten Schöning AM-SoFT IT-Service - Bitstore Hameln GmbH i.G. ist ein Mitglied der Bitstore Gruppe - Ihr Full-Service-Dienstleister für IT und TK E-Mail: Thorsten.Schoening@xxxxxxxxxx Web: http://www.AM-SoFT.de/ Telefon: 05151- 9468- 0 Telefon: 05151- 9468-55 Fax: 05151- 9468-88 Mobil: 0178-8 9468-04 AM-SoFT IT-Service - Bitstore Hameln GmbH i.G., Brandenburger Str. 7c, 31789 Hameln AG Hannover HRB neu - Geschäftsführer: Janine Galonska Für Rückfragen stehe ich Ihnen sehr gerne zur Verfügung. Mit freundlichen Grüßen Thorsten Schöning Tel: 05151 9468 0 Fax: 05151 9468 88 Mobil: Webseite: https://www.am-soft.de AM-Soft IT-Service - Bitstore Hameln GmbH i.G. ist ein Mitglied der Bitstore Gruppe - Ihr Full-Service-Dienstleister für IT und TK AM-Soft IT-Service - Bitstore Hameln GmbH i.G. Brandenburger Str. 7c 31789 Hameln Tel: 05151 9468 0 Bitstore IT-Consulting GmbH Zentrale - Berlin Lichtenberg Frankfurter Allee 285 10317 Berlin Tel: 030 453 087 80 CBS IT-Service - Bitstore Kaulsdorf UG Tel: 030 453 087 880 1 Büro Dallgow-Döberitz Tel: 03322 507 020 Büro Kloster Lehnin Tel: 033207 566 530 PCE IT-Service - Bitstore Darmstadt UG Darmstadt Tel: 06151 392 973 0 Büro Neuruppin Tel: 033932 606 090 ACI EDV Systemhaus Dresden GmbH Dresden Tel: 0351 254 410 Das Systemhaus - Bitstore Magdeburg GmbH Magdeburg Tel: 0391 636 651 0 Allerdata.IT - Bitstore Wittenberg GmbH Wittenberg Tel: 03491 876 735 7 Büro Liebenwalde Tel: 033054 810 00 HSA - das Büro - Bitstore Altenburg UG Altenburg Tel: 0344 784 390 97 Bitstore IT – Consulting GmbH NL Piesteritz Piesteritz Tel: 03491 644 868 6 Solltec IT-Services - Bitstore Braunschweig UG Braunschweig Tel: 0531 206 068 0 MF Computer Service - Bitstore Gütersloh GmbH Gütersloh Tel: 05245 920 809 3 Firmensitz: MF Computer Service - Bitstore Gütersloh GmbH, Gildestraße 25, 33442 Herzebrock-Clarholz Geschäftsführer Janine Galonska
