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When committing a transaction that dropped a relation, we previously truncated only the first segment file to free up disk space (the one that won't be unlinked until the next checkpoint). Truncate higher numbered segments too, even though we unlink them on commit. This frees the disk space immediately, even if other backends have open file descriptors and might take a long time to get around to handling shared invalidation events and closing them. Also extend the same behavior to the first segment, in recovery. Back-patch to all supported releases. Bug: #16663 Reported-by: Denis Patron <denis.patron@previnet.it> Reviewed-by: Pavel Borisov <pashkin.elfe@gmail.com> Reviewed-by: Neil Chen <carpenter.nail.cz@gmail.com> Reviewed-by: David Zhang <david.zhang@highgo.ca> Discussion: https://postgr.es/m/16663-fe97ccf9932fc800%40postgresql.org
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/.