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This commit tweaks a couple of things in 035_standby_logical_decoding to hopefully stabilize it: - Autovacuum is now disabled, as it could hold a global xmin with a transaction. - Conflicts are generated with command sequences that removed rows (on catalogs, shared or non-shared, or just plain relations) followed by a VACUUM. This was unstable because these did not check that the horizon moved between the SQL commands and the VACUUM. The logic is refactored as follows, to ensure that VACUUM removes dead rows before testing for slot invalidation on a standby (idea suggested by Andres Freund): -- Grab the current horizon. -- Launch SQL commands removing rows. -- Check that the snapshot horizon has been updated. -- Launch VACUUM on the relation whose rows have been removed by the first step. Note that there are still some issues because of standby snapshot WAL records generated by the bgwriter, but this makes the test much more stable. Per reports from buildfarm members dikkop and skink, with analysis and tests from Alexander Lakhin. While on it, fix a couple of incorrect comments. Author: Bertrand Drouvot Reviewed-by: Alexander Lakhin, Michael Paquier Discussion: https://postgr.es/m/OSZPR01MB6310ED3CEDB531BCEDBC6AF2FD479@OSZPR01MB6310.jpnprd01.prod.outlook.com Discussion: https://postgr.es/m/bf67e076-b163-9ba3-4ade-b9fc51a3a8f6@gmail.com Backpatch-through: 16 |
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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/.