rdelaage/postgresql
1
0
Fork 0
mirror of https://git.postgresql.org/git/postgresql.git synced 2024-08-29 00:57:20 +02:00
Code Issues Packages Projects Releases Wiki Activity
57,727 Commits 36 Branches 606 Tags 423 MiB
C 86%
PLpgSQL 5.5%
Perl 4.1%
Yacc 1.3%
Makefile 0.7%
Other 2.3%
b619852086
Go to file
Michael Paquier b619852086 Improve COPY TO performance when server and client encodings match 
This commit fixes an oversight introduced in c61a2f5841, where COPY TO
would attempt to do encoding conversions even if the encodings of the
client and the server matched for multi-byte encodings.  All conversions
go through pg_any_to_server() that makes the conversion a no-op when the
encodings of the client and the server match, even for multi-byte
encodings.

The logic was fine, but setting CopyToStateData->need_transcoding would
cause strlen() to be called for nothing for each attribute of all the
rows copied, and that was showing high in some profiles (more attributes
make that easier to reach).  This change improves the runtime of some
worst-case COPY TO queries by 15%~ (number present at least here).

This is a performance improvement, so no backpatch is done out of
caution as this is not a regression.

Reported-by: Andres Freund
Analyzed-by: Andres Freund
Author: Michael Paquier
Reviewed-by: Heikki Linnakangas
Discussion: https://postgr.es/m/20240206020504.edijzczkgd25ek6z@awork3.anarazel.de
2024-02-09 09:30:53 +09:00
config jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
contrib pgcrypto: Fix check for buffer size 2024-01-30 11:15:46 +01:00
doc doc: Remove superfluous bracket in synopsis 2024-02-08 12:19:34 +01:00
src Improve COPY TO performance when server and client encodings match 2024-02-09 09:30:53 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Enable injection points in builds 2024-01-23 12:01:18 +09:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
.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 previous commit to .git-blame-ignore-revs. 2024-01-13 13:56:46 -05:00
.gitattributes Replace Gen_dummy_probes.sed with Gen_dummy_probes.pl 2023-11-14 10:27:10 +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 jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
configure.ac Add backend support for injection points 2024-01-22 10:15:50 +09:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00
meson_options.txt Add backend support for injection points 2024-01-22 10:15:50 +09:00
meson.build jit: Require at least LLVM 10. 2024-01-25 15:42:34 +13:00
README Stop generating plain-text INSTALL instructions. 2023-12-22 13:32:15 -05:00

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.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at:
https://www.postgresql.org/docs/devel/
In particular, information about building PostgreSQL from the source
code can be found at:
https://www.postgresql.org/docs/devel/installation.html

The latest version of this software, and related software, may be
obtained at https://www.postgresql.org/download/.  For more information
look at our web site located at https://www.postgresql.org/.