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Peter Geoghegan f214960add Update obsolete heap pruning comments. Add new comments that spell out what VACUUM expects from heap pruning: pruning must never leave behind DEAD tuples that still have tuple storage. This has at least been the case since commit `8523492d`, which established the principle that vacuumlazy.c doesn't have to deal with DEAD tuples that still have tuple storage directly, except perhaps by simply retrying pruning (to handle a rare corner case involving concurrent transaction abort). In passing, update some references to old symbol names that were missed by the snapshot scalability work (specifically commit `dc7420c2c9`).		2021-11-05 14:08:47 -07:00
config	Adjust configure to insist on Perl version >= 5.8.3.	2021-10-07 14:26:17 -04:00
contrib	amcheck: Add additional TOAST pointer checks.	2021-11-05 09:24:25 -04:00
doc	Document that ALTER TABLE .. TYPE removes statistics	2021-11-05 12:09:31 -03:00
src	Update obsolete heap pruning comments.	2021-11-05 14:08:47 -07:00
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configure	Make configure check for minimum required version of IPC::Run.	2021-10-11 16:49:49 -04:00
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README

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/.