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During upgrade, when pg_restore performs CREATE DATABASE, bgwriter or checkpointer may flush buffers and hold a file handle for pg_largeobject, so later TRUNCATE pg_largeobject command will fail if OS (such as older Windows versions) doesn't remove an unlinked file completely till it's open. The probability of seeing this behavior is higher in this test because we use wal_level as logical via allows_streaming => 'logical' which in turn set shared_buffers as 1MB and make it more probable for bgwriter to hold the file handle. Diagnosed-by: Alexander Lakhin Author: Hayato Kuroda, Amit Kapila Reviewed-by: Alexander Lakhin Discussion: https://postgr.es/m/TYAPR01MB5866AB7FD922CE30A2565B8BF5A8A@TYAPR01MB5866.jpnprd01.prod.outlook.com
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. Copyright and license information can be found in the file COPYRIGHT. General documentation about this version of PostgreSQL can be found at: https://www.postgresql.org/docs/devel/ In particular, information about building PostgreSQL from the source code can be found at: https://www.postgresql.org/docs/devel/installation.html The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.