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Multiple non-exclusive backups are able to be run conrrently in different sessions. But, in the same session, only one non-exclusive backup can be run at the same moment. If pg_backup_start (pg_start_backup in v14 or before) is called in the middle of another non-exclusive backup in the same session, an error is thrown. However, previously, in logical replication walsender mode, even if that walsender session had already called pg_backup_start and started a non-exclusive backup, it could execute BASE_BACKUP command and start another non-exclusive backup. Which caused subsequent pg_backup_stop to throw an error because BASE_BACKUP unexpectedly reset the session state marked by pg_backup_start. This commit prevents BASE_BACKUP command in the middle of another non-exclusive backup in the same session. Back-patch to all supported branches. Author: Fujii Masao Reviewed-by: Kyotaro Horiguchi, Masahiko Sawada, Michael Paquier, Robert Haas Discussion: https://postgr.es/m/3374718f-9fbf-a950-6d66-d973e027f44c@oss.nttdata.com |
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PostgreSQL Database Management System ===================================== This directory contains the source code distribution of the PostgreSQL database management system. PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings. PostgreSQL has many language interfaces, many of which are listed here: https://www.postgresql.org/download See the file INSTALL for instructions on how to build and install PostgreSQL. That file also lists supported operating systems and hardware platforms and contains information regarding any other software packages that are required to build or run the PostgreSQL system. Copyright and license information can be found in the file COPYRIGHT. A comprehensive documentation set is included in this distribution; it can be read as described in the installation instructions. The latest version of this software may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.