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Doc: add information about partition locking

author David Rowley <drowley@postgresql.org>

Wed, 2 Apr 2025 01:04:31 +0000 (14:04 +1300)

committer David Rowley <drowley@postgresql.org>

Wed, 2 Apr 2025 01:04:31 +0000 (14:04 +1300)

The documentation around locking of partitions for the executor startup
phase of run-time partition pruning wasn't clear about which partitions
were being locked. Fix that.

Reviewed-by: Tender Wang <tndrwang@gmail.com>
Discussion: https://postgr.es/m/CAApHDvp738G75HfkKcfXaf3a8s%3D6mmtOLh46tMD0D2hAo1UCzA%40mail.gmail.com
Backpatch-through: 13

doc/src/sgml/ddl.sgml patch | blob | blame | history

diff --git a/doc/src/sgml/ddl.sgml b/doc/src/sgml/ddl.sgml

index 7f3d7e2c3e871c28826fe1b5cfc36a7d6b5d01a4..dd00bbdaa79bdb6cbc25b2dd9ba664fe86294a41 100644 (file)

--- a/doc/src/sgml/ddl.sgml

+++ b/doc/src/sgml/ddl.sgml

@@ -4812,7 +4812,9 @@ EXPLAIN SELECT count(*) FROM measurement WHERE logdate >= DATE '2008年01月01日';

It is possible to determine the number of partitions which were

removed during this phase by observing the

<quote>Subplans Removed</quote> property in the

- <command>EXPLAIN</command> output.

+ <command>EXPLAIN</command> output. It's important to note that any

+ partitions removed by the partition pruning done at this stage are

+ still locked at the beginning of execution.

</para>

</listitem>

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