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doc: Clarify CHECKPOINT handling of unlogged buffers

Daniel Gustafsson <dgustafsson@postgresql.org>

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Commit: 377cc45194f4f1bd6eb68bd6eb42402e46e326d7
Author: Daniel Gustafsson <dgustafsson@postgresql.org>
Date: 2026-05-25T10:15:29Z
Releases: 19 (unreleased) 
doc: Clarify CHECKPOINT handling of unlogged buffers

The CHECKPOINT reference page still described checkpoints as flushing
all data files, which could be misleading as it depends on the value
of FLUSH_UNLOGGED option.  Update the description to make it clearer
that only data files of permanent relations are flushed by default.

Author: Chao Li <lic@highgo.com>
Reviewed-by: Daniel Gustafsson <daniel@yesql.se>
Discussion: https://postgr.es/m/4855807D-F1CA-44E6-9B58-406691832848@gmail.com

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doc/src/sgml/ref/checkpoint.sgml modified +4 −2

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