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Peter Geoghegan c34787f910 Harden nbtree page deletion. Add some additional defensive checks in the second phase of index deletion to detect and report index corruption during VACUUM, and to avoid having VACUUM become stuck in more cases. The code is still not robust in the presence of a circular chain of sibling links, though it's not clear whether that really matters. This is follow-up work to commit `3a01f68e`. The new defensive checks rely on the assumption that there can be no more than one VACUUM operation running for an index at any given time. Remove an old comment suggesting that multiple concurrent VACUUMs need to be considered here. This concern now seems highly unlikely to have any real validity, since we clearly rely on the same assumption in several other places. For example, there are much more recent comments that appear in the same function (added by commit `efada2b8e9`) that make the same assumption. Also add a CHECK_FOR_INTERRUPTS() to the relevant code path. Contrary to comments added by commit `3a01f68e`, it is actually possible to handle interrupts here, at least in the common case where processing takes place at the leaf level. We only hold a pin on leafbuf/target page when stepping right at the leaf level. No backpatch due to the lack of complaints following hardening added to the same area by commit `3a01f68e`.		2021-02-04 15:42:36 -08:00
config	Update copyright for 2021	2021-01-02 13:06:25 -05:00
contrib	Fix ancient memory leak in contrib/auto_explain.	2021-02-02 13:49:08 -05:00
doc	Refactor Windows error message for easier translation	2021-02-04 13:31:13 +01:00
src	Harden nbtree page deletion.	2021-02-04 15:42:36 -08:00
.dir-locals.el	Make Emacs perl-mode indent more like perltidy.	2019-01-13 11:32:31 -08:00
.editorconfig	Add .editorconfig	2019-12-18 09:13:13 +01:00
.gitattributes	gitattributes: Add new file	2019-11-12 08:13:55 +01:00
.gitignore	Support for optimizing and emitting code in LLVM JIT provider.	2018-03-22 11:05:22 -07:00
COPYRIGHT	Update copyright for 2021	2021-01-02 13:06:25 -05:00
GNUmakefile.in	Make install-tests target work with vpath builds	2020-05-31 18:33:00 -04:00
HISTORY	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
Makefile	Don't unset MAKEFLAGS in non-GNU Makefile.	2019-06-25 09:36:21 +12:00
README	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
README.git	Canonicalize some URLs	2020-02-10 20:47:50 +01:00
aclocal.m4	Remove configure-time probe for DocBook DTD.	2020-11-30 15:24:13 -05:00
configure	Introduce --with-ssl={openssl} as a configure option	2021-02-01 19:19:44 +09:00
configure.ac	Introduce --with-ssl={openssl} as a configure option	2021-02-01 19:19:44 +09:00

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/.