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doc: Clarify CHECKPOINT handling of unlogged buffers

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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
This commit is contained in:
Daniel Gustafsson 2026-05-25 12:15:29 +02:00
parent 7e5d8bd013
commit 377cc45194
1 changed files with 4 additions and 2 deletions
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6
doc/src/sgml/ref/checkpoint.sgml
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@ -35,8 +35,10 @@ CHECKPOINT [ ( option [, ...] ) ]
<para>
A checkpoint is a point in the write-ahead log sequence at which
all data files have been updated to reflect the information in the
log. All data files will be flushed to disk. Refer to
all data files for permanent relations have been updated to reflect the
information in the log. All data for permanent relations files will be
flushed to disk, dirty buffers of unlogged relations are not flushed unless
<literal>FLUSH_UNLOGGED</literal> is specified. Refer to
<xref linkend="wal-configuration"/> for more details about what happens
during a checkpoint.
</para>