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Dropping a database while a connection is attempted on it was able to lead to the presence of valid database entries in shared statistics. The issue is that MyDatabaseId was getting set too early than it should, as, if the connection attempted on the dropped database fails when renamed or dropped, the shutdown callback of the shared statistics would finish by re-inserting a correct entry related to the database already dropped. As analyzed by the bug reporters, this issue could lead to phantom entries in the database list maintained by the autovacuum launcher (in rebuild_database_list()) if the database dropped was part of the database list when it was still valid. After the database was dropped, it would remain the highest on the list of databases to considered by the autovacuum worker as things to process. This would prevent autovacuum jobs to happen on all the other databases still present. The commit fixes this issue by delaying setting MyDatabaseId until the database existence has been re-checked with the second scan on pg_database after getting a shared lock on it, and by switching pgstat_update_dbstats() so as nothing happens if MyDatabaseId is not valid. Issue introduced by 5891c7a8ed8f, so backpatch down to 15. Reported-by: Will Mortensen, Jacob Speidel Analyzed-by: Will Mortensen, Jacob Speidel Author: Andres Freund Discussion: https://postgr.es/m/17973-bca1f7d5c14f601e@postgresql.org Backpatch-through: 15
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/.