9733eb9e8d
6dbb490261combined pruning and freezing in a single WAL record but unconditionally requested a cleanup lock during replay. Prior to version 17, freeze-only records were replayed under an ordinary exclusive lock.1252a4ee28subsequently folded visibility map updates into the same records, extending the unnecessary cleanup-lock requirement to VM-only updates starting in version 19. Request a cleanup lock in redo only when the record actually prunes. Freezing and visibility updates do not move or remove tuple storage, so they need not wait for other buffer pins to be released. This avoids unnecessary replay delays and cancellation of standby queries holding buffer pins. The fix is the same for all versions, though it addresses two oversights in master/19 and one in 18/17. Reported-by: Satyanarayana Narlapuram <satyanarlapuram@gmail.com> Reported-by: Andrey Borodin <x4mmm@yandex-team.ru> Reviewed-by: Andrey Borodin <x4mmm@yandex-team.ru> Discussion: https://postgr.es/m/85b6968b-49f2-4243-86a6-9b4116e6439b@iki.fi Discussion: https://postgr.es/m/CAHg+QDf3NcB3vOAqQ5EFcV5DYYUZ9snCSJAU-x1JDbtcjK3eBQ@mail.gmail.com Discussion: https://postgr.es/m/F9BF304E-1298-481C-829A-B4E10AED025A@yandex-team.ru Backpatch-through: 17
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/18/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/18/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/.