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Michael Paquier f56a9def71 Fix inconsistency with replay of hash squeeze record for clean buffers 
aa5edbe379 has tweaked _hash_freeovflpage() so as the write buffer's
LSN is updated only when necessary, when REGBUF_NO_CHANGE is not used.

The replay code was not consistent with that, causing the write buffer's
LSN to be updated and its page to be marked as dirty even if the buffer
was registered in a "clean" state.  This was possible for the case of a
squeeze record when there are no tuples to add to the write buffer, for
(is_prim_bucket_same_wrt && !is_prev_bucket_same_wrt).

I have performed some validation of this commit with
wal_consistency_checking and a change in WAL that logs REGBUF_NO_CHANGE
to a new BKPIMAGE_*.  Thanks to that, it is possible to know at replay
if a buffer was clean when it was registered, then cross-checked the LSN
of the "clean" page copy coming from WAL with the LSN of the block once
the record has been replayed.  This eats one bit in bimg_info, which is
not acceptable to be integrated as-is, but it could become handy in the
future.  I didn't spot other areas than the one fixed by this commit at
the extent of what the main regression test suite covers.

As this is an oversight in aa5edbe379, no backpatch is required.

Reported-by: Zubeyr Eryilmaz
Author: Hayato Kuroda
Reviewed-by: Amit Kapila, Michael Paquier
Discussion: https://postgr.es/m/ZbyVVG_7eW3YD5-A@paquier.xyz
 		2024-04-11 09:20:51 +09:00
config Update config.guess and config.sub 2024-04-09 14:21:57 +02:00
contrib Fixup various StringInfo function usages 2024-04-10 11:53:32 +12:00
doc Doc: Update ulinks to RFC documents to avoid redirect 2024-04-10 13:53:25 +02:00
src Fix inconsistency with replay of hash squeeze record for clean buffers 2024-04-11 09:20:51 +09:00
.cirrus.star Remove duplicate words in docs and code comments. 2023-10-09 09:18:47 +05:30
.cirrus.tasks.yml Add tests for libpq gssencmode and sslmode options 2024-04-08 02:49:32 +03:00
.cirrus.yml ci: Make compute resources for CI configurable 2023-08-23 15:15:28 -07:00
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HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Remove AIX support 2024-02-28 15:17:23 +04:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Optimize pg_popcount() with AVX-512 instructions. 2024-04-06 21:56:23 -05:00
configure.ac Optimize pg_popcount() with AVX-512 instructions. 2024-04-06 21:56:23 -05:00
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meson_options.txt Add backend support for injection points 2024-01-22 10:15:50 +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/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/.