57184c3b5d
The old text claims that HOT completely removes old row versions. It was unclear whether it just meant the tuples themselves, or the tuples together with their line pointers. If it meant the former, it was wrong because we can remove dead row versions even when no HOT updates have occurred, so it's not describing a benefit of HOT. If it meant the latter, it was wrong because HOT doesn't allow reclaiming the root tuple's line pointer. This section does seems like it's intended to be more of an informal introduction to HOT than a precise technical description of every detail of how it works, but we still don't want it to say things that are just not true, so update the text enough to avoid that. Patch by me, reviewed by James Coleman (although he would have preferred more extensive changes) and Shubham Khanna. Discussion: http://postgr.es/m/CA+TgmobH6DPmR-u--Xgeg8cYUwhDhypNsv38nDrAJyf_xno=TQ@mail.gmail.com |
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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/.