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Tom Lane 81db073a28 Count individual SQL commands in pg_restore's --transaction-size mode. 
The initial implementation in commit 959b38d77 counted one action
per TOC entry (except for some special cases for multi-blob BLOBS
entries).  This assumes that TOC entries are all about equally
complex, but it turns out that that assumption doesn't hold up very
well in binary-upgrade mode.  For example, even after the previous
commit I was able to cause backend bloat with tables having many
inherited constraints.  There may be other cases too.  (Since no
serious problems have been reported with --single-transaction mode,
we can conclude that the backend copes well with psql's regular
restore scripts; but before 959b38d77 we never ran binary-upgrade
restores with multi-command transactions.)

To fix, count multi-command TOC entries as N actions, allowing the
transaction size to be scaled down when we hit a complex TOC entry.
Rather than add a SQL parser to pg_restore, approximate "multi
command" by counting semicolons in the TOC entry's defn string.
This will be fooled by semicolons appearing in string literals ---
but the error is in the conservative direction, so it doesn't seem
worth working harder.  The biggest risk is with function/procedure
TOC entries, but we can just explicitly skip those.

(This is undoubtedly a hack, and maybe someday we'll be able to
revert it after fixing the backend's bloat issues or rethinking
what pg_dump emits in binary upgrade mode.  But that surely isn't
a project for v17.)

Thanks to Alexander Korotkov for the let's-count-semicolons idea.

Per report from Justin Pryzby.  Back-patch to v17 where txn_size mode
was introduced.

Discussion: https://postgr.es/m/ZqEND4ZcTDBmcv31@pryzbyj2023
2024-07-29 12:17:24 -04:00
config jit: Remove {llvm-config,clang}-N configure probes. 2024-05-16 13:58:25 +12:00
contrib postgres_fdw: Split out the query_cancel test to its own file 2024-07-22 12:49:57 +02:00
doc doc PG 17 relnotes: add "()" to PQsocketPoll mention 2024-07-28 04:10:11 -04:00
src Count individual SQL commands in pg_restore's --transaction-size mode. 2024-07-29 12:17:24 -04:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml ci: Pin MacPorts version to 2.9.3. 2024-07-25 14:48:18 +12:00
.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 da256a4a7 to .git-blame-ignore-revs. 2024-05-14 16:37:22 -04:00
.gitattributes Remove non-existing file from .gitattributes 2024-02-16 11:39:09 +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 Disable all TLS session tickets 2024-07-26 11:09:45 +02:00
configure.ac Disable all TLS session tickets 2024-07-26 11:09:45 +02:00
COPYRIGHT Update copyright for 2024 2024-01-03 20:49:05 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00
meson.build Support falling back to non-preferred readline implementation with meson 2024-07-27 13:54:16 +03:00
meson_options.txt Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
README.md Adapt REL_17_STABLE to its new status as a stable branch 2024-07-01 08:05:35 +09:00

README.md

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/17/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/17/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/.