6dbb490261
Execute both freezing and pruning of tuples in the same heap_page_prune() function, now called heap_page_prune_and_freeze(), and emit a single WAL record containing all changes. That reduces the overall amount of WAL generated. This moves the freezing logic from vacuumlazy.c to the heap_page_prune_and_freeze() function. The main difference in the coding is that in vacuumlazy.c, we looked at the tuples after the pruning had already happened, but in heap_page_prune_and_freeze() we operate on the tuples before pruning. The heap_prepare_freeze_tuple() function is now invoked after we have determined that a tuple is not going to be pruned away. VACUUM no longer needs to loop through the items on the page after pruning. heap_page_prune_and_freeze() does all the work. It now returns the list of dead offsets, including existing LP_DEAD items, to the caller. Similarly it's now responsible for tracking 'all_visible', 'all_frozen', and 'hastup' on the caller's behalf. Author: Melanie Plageman <melanieplageman@gmail.com> Discussion: https://www.postgresql.org/message-id/20240330055710.kqg6ii2cdojsxgje@liskov |
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| config | ||
| contrib | ||
| doc | ||
| src | ||
| .cirrus.star | ||
| .cirrus.tasks.yml | ||
| .cirrus.yml | ||
| .dir-locals.el | ||
| .editorconfig | ||
| .git-blame-ignore-revs | ||
| .gitattributes | ||
| .gitignore | ||
| aclocal.m4 | ||
| configure | ||
| configure.ac | ||
| COPYRIGHT | ||
| GNUmakefile.in | ||
| HISTORY | ||
| Makefile | ||
| meson_options.txt | ||
| meson.build | ||
| README.md | ||
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/.