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Peter Geoghegan e48c817395 Recycle deleted nbtree pages more aggressively. 
Commit 61b313e4 made nbtree consistently pass down a heaprel to low
level routines like _bt_getbuf().  Although this was primarily intended
as preparation for logical decoding on standbys, it also made it easy to
correct an old deficiency in how nbtree VACUUM determines whether or not
it's now safe to recycle deleted pages.

Pass the heaprel to GlobalVisTestFor() in nbtree routines that deal with
recycle safety.  nbtree now makes less pessimistic assumptions about
recycle safety within non-catalog relations.  This enhancement
complements the recycling enhancement added by commit 9dd963ae25.

nbtree remains just as pessimistic as ever when it comes to recycle
safety within indexes on catalog relations.  There is no fundamental
reason why we need to treat catalog relations differently, though.  The
behavioral inconsistency is a consequence of the way that nbtree uses
nextXID values to implement what Lanin and Shasha call "the drain
technique".  Note in particular that it has nothing to do with whether
or not index tuples might still be required for an older MVCC snapshot.

Author: Bertrand Drouvot <bertranddrouvot.pg@gmail.com>
Discussion: https://postgr.es/m/CAH2-WzkaiDxCje0yPuH=3Uh2p1V_2pFGY==xfbZoZu7Ax_NB8g@mail.gmail.com
2023-04-03 11:31:43 -07:00
config autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
contrib Fix copy-pasto in contrib/auth_delay/meson.build variable name. 2023-04-02 09:31:10 -07:00
doc Disable vacuum's use of a buffer access strategy during failsafe 2023-04-03 23:05:58 +12:00
src Recycle deleted nbtree pages more aggressively. 2023-04-03 11:31:43 -07:00
.cirrus.yml Support connection load balancing in libpq 2023-03-29 21:53:38 +02:00
.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
.git-blame-ignore-revs Add b6dfee28 to .git-blame-ignore-revs 2023-03-09 19:26:03 +09:00
.gitattributes gitattributes: Ignore imported pg_bsd_indent code for whitespace checks 2023-02-22 09:00:28 +01:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure libpq: Add sslcertmode option to control client certificates 2023-03-24 13:34:26 +09:00
configure.ac libpq: Add sslcertmode option to control client certificates 2023-03-24 13:34:26 +09:00
COPYRIGHT Update copyright for 2023 2023-01-02 15:00:37 -05:00
GNUmakefile.in Integrate pg_bsd_indent into our build/test infrastructure. 2023-02-12 12:22:21 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Dynamically find correct installation docs in Makefile. 2022-01-19 14:48:25 +01:00
meson.build pg_regress: Emit TAP compliant output 2023-03-31 13:00:02 +02:00
meson_options.txt meson: Make auto the default of the ssl option 2023-03-13 07:04:11 +01:00
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

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/.