8180136652
Blocking checkpoint phase 2 requires MarkBufferDirty() and BUFFER_LOCK_EXCLUSIVE; neither suffices by itself. transam/README documents this, citing SyncOneBuffer(). Update the DELAY_CHKPT_START documentation to say this. Expand the heap_inplace_update_and_unlock() comment that cites XLogSaveBufferForHint() as precedent, since heap_inplace_update_and_unlock() could have opted not to use DELAY_CHKPT_START. Commit 8e7e672cdaa6bfec85d4d5dd9be84159df23bb41 added DELAY_CHKPT_START to heap_inplace_update_and_unlock(). Since commit bc6bad88572501aecaa2ac5d4bc900ac0fd457d5 reverted it in non-master branches, no back-patch. Discussion: https://postgr.es/m/20250406180054.26.nmisch@google.com
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/.