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Peter Geoghegan 39132b784a Teach amcheck to verify sibling links in all cases.
Teach contrib/amcheck's bt_index_check() function to check agreement
between siblings links.  The left sibling's right link should point to a
right sibling page whose left link points back to the same original left
sibling.  This extends a check that bt_index_parent_check() always
performed to bt_index_check().

This is the first time amcheck has been taught to perform buffer lock
coupling, which we have explicitly avoided up until now.  The sibling
link check tends to catch a lot of real world index corruption with
little overhead, so it seems worth accepting the complexity.  Note that
the new lock coupling logic would not work correctly on replica servers
without the changes made by commits 0a7d771f and 9a9db08a (there could
be false positives without those changes).

Author: Andrey Borodin, Peter Geoghegan
Discussion: https://postgr.es/m/0EB0CFA8-CBD8-4296-8049-A2C0F28FAE8C@yandex-team.ru
2020-08-08 11:12:01 -07:00
config Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
contrib Teach amcheck to verify sibling links in all cases. 2020-08-08 11:12:01 -07:00
doc Implement streaming mode in ReorderBuffer. 2020-08-08 07:47:06 +05:30
src walsnd: Don't set waiting_for_ping_response spuriously 2020-08-08 12:31:55 -04:00
.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
aclocal.m4 Fix configure's AC_CHECK_DECLS tests to work correctly with clang. 2018-11-19 12:01:47 -05:00
configure Define OPENSSL_API_COMPAT 2020-07-19 12:14:42 +02:00
configure.ac Rename configure.in to configure.ac 2020-07-24 10:42:08 +02:00
COPYRIGHT Update copyrights for 2020 2020-01-01 12:21:45 -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

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/.