rdelaage/postgresql
1
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-09-07 01:19:21 +02:00
Code Issues Packages Projects Releases Wiki Activity
52,598 Commits 36 Branches 606 Tags 423 MiB
C 86%
PLpgSQL 5.5%
Perl 4.1%
Yacc 1.3%
Makefile 0.7%
Other 2.3%
1a6f5a0e87
Go to file
Peter Geoghegan 1a6f5a0e87 Go back to considering HOT on pages marked full. 
Commit 2fd8685e7f simplified the checking of modified attributes that
takes place within heap_update().  This included a micro-optimization
affecting pages marked PD_PAGE_FULL: don't even try to use HOT to save a
few cycles on determining HOT safety.  The assumption was that it won't
work out this time around, since it can't have worked out last time
around.

Remove the micro-optimization.  It could only ever save cycles that are
consumed by the vast majority of heap_update() calls, which hardly seems
worth the added complexity.  It also seems quite possible that there are
workloads that will do worse over time by repeated application of the
micro-optimization, despite saving some cycles on average, in the short
term.

Author: Peter Geoghegan <pg@bowt.ie>
Reviewed-By: Álvaro Herrera <alvherre@alvh.no-ip.org>
Discussion: https://postgr.es/m/CAH2-WznU1L3+DMPr1F7o2eJBT7=3bAJoY6ZkWABAxNt+-afyTA@mail.gmail.com
2021-11-26 10:58:38 -08:00
config Pacify perlcritic. 2021-11-22 15:57:31 -05:00
contrib Fix incorrect format placeholders 2021-11-24 08:15:17 +01:00
doc Copy-edit vacuuumdb --analyze-in-stages doc blurb 2021-11-26 14:42:15 -03:00
src Go back to considering HOT on pages marked full. 2021-11-26 10:58:38 -08:00
.dir-locals.el
.editorconfig
.git-blame-ignore-revs Add another old commit to git-blame-ignore-revs. 2021-11-03 17:34:19 -07:00
.gitattributes
.gitignore
aclocal.m4 Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
configure.ac Probe $PROVE not $PERL while checking for modules needed by TAP tests. 2021-11-22 12:54:52 -05:00
COPYRIGHT
GNUmakefile.in
HISTORY
Makefile
README Canonicalize some URLs 2020-02-10 20:47:50 +01:00
README.git

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/.