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To take an incremental backup, you use the new replication command
UPLOAD_MANIFEST to upload the manifest for the prior backup. This
prior backup could either be a full backup or another incremental
backup. You then use BASE_BACKUP with the INCREMENTAL option to take
the backup. pg_basebackup now has an --incremental=PATH_TO_MANIFEST
option to trigger this behavior.
An incremental backup is like a regular full backup except that
some relation files are replaced with files with names like
INCREMENTAL.${ORIGINAL_NAME}, and the backup_label file contains
additional lines identifying it as an incremental backup. The new
pg_combinebackup tool can be used to reconstruct a data directory
from a full backup and a series of incremental backups.
Patch by me. Reviewed by Matthias van de Meent, Dilip Kumar, Jakub
Wartak, Peter Eisentraut, and Álvaro Herrera. Thanks especially to
Jakub for incredibly helpful and extensive testing.
Discussion: http://postgr.es/m/CA+TgmoYOYZfMCyOXFyC-P+-mdrZqm5pP2N7S-r0z3_402h9rsA@mail.gmail.com
44 lines
1.4 KiB
C
44 lines
1.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* xlogbackup.h
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* Definitions for internals of base backups.
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*
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* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* IDENTIFICATION
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* src/include/access/xlogbackup.h
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*-------------------------------------------------------------------------
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*/
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#ifndef XLOG_BACKUP_H
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#define XLOG_BACKUP_H
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#include "access/xlogdefs.h"
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#include "pgtime.h"
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/* Structure to hold backup state. */
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typedef struct BackupState
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{
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/* Fields saved at backup start */
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/* Backup label name one extra byte for null-termination */
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char name[MAXPGPATH + 1];
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XLogRecPtr startpoint; /* backup start WAL location */
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TimeLineID starttli; /* backup start TLI */
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XLogRecPtr checkpointloc; /* last checkpoint location */
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pg_time_t starttime; /* backup start time */
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bool started_in_recovery; /* backup started in recovery? */
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XLogRecPtr istartpoint; /* incremental based on backup at this LSN */
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TimeLineID istarttli; /* incremental based on backup on this TLI */
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/* Fields saved at the end of backup */
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XLogRecPtr stoppoint; /* backup stop WAL location */
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TimeLineID stoptli; /* backup stop TLI */
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pg_time_t stoptime; /* backup stop time */
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} BackupState;
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extern char *build_backup_content(BackupState *state,
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bool ishistoryfile);
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#endif /* XLOG_BACKUP_H */
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