Guten Tag Stephen Frost, am Freitag, 23. Juli 2021 um 17:24 schrieben Sie: > [...]Similar, once you reach the BACKUP_END record of > a backup you know the database is consistent- but only if all of the > files that PG was writing to were copied between the start checkpoint > of the backup and the BACKUP_END record in the WAL. So I am correct that the recovery process starts at what is documented as CHECKPOINT LOCATION in the file backup_label? If the data directory looks like a more current checkpoint might be available, that is NOT used? Instead, all available WALs are replayed? But how come the state of other data files into the recovery process? that's what Laurenz Albe's example is about: A data file which is more current than expected because that file is only copied, but the associated changes are stored in WALs after pg_stop_backup and therefore need to be considered lost. Why is the data file with that additional row in B used at all? The additional row is associated with a transaction number not available when restoring based on CHECKPOINT LOCATION + WALs of pg_stop_backup. So why is that row used at all instead of simply ignored? That would actually revert the cluster to the state of pg_stop_backup, but as said, backup outdate anyway. I still don't get why the result is not as consistent as e.g. a crash at the same point in time instead of doing a backup. Mit freundlichen Grüßen Thorsten Schöning -- AM-SoFT IT-Service - Bitstore Hameln GmbH Mitglied der Bitstore Gruppe - Ihr Full-Service-Dienstleister für IT und TK E-Mail: Thorsten.Schoening@xxxxxxxxxx Web: http://www.AM-SoFT.de/ Tel: 05151- 9468- 0 Tel: 05151- 9468-55 Fax: 05151- 9468-88 Mobil: 0178-8 9468-04 AM-SoFT IT-Service - Bitstore Hameln GmbH, Brandenburger Str. 7c, 31789 Hameln AG Hannover HRB 221853 - 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 - Bitstore 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: AM-Soft IT-Service - Bitstore Hameln GmbH i.G. , Brandenburger Str. 7c , 31789 Hameln Geschäftsführer Janine Galonska
