From 75f09cc460a3a1780df1dcd102f46e59779f9903 Mon Sep 17 00:00:00 2001
From: David Rowley <drowley@postgresql.org>
Date: Tue, 29 Oct 2024 16:25:29 +1300
Subject: [PATCH] Doc: clarify enable_indexscan=off also disabled Index Only
 Scans

Disabling enable_indexscan has always also disabled Index Only Scans.
Here we make that more clear in the documentation in an attempt to
prevent future complaints complaining about this expected behavior.

Reported-by: Melanie Plageman
Author: David G. Johnston, David Rowley
Backpatch-through: 12, oldest supported version
Discussion: https://postgr.es/m/CAAKRu_atV=kovgpaLREyG68PB5+ncKvJ2UNoeRetEgyC3Yb5Sw@mail.gmail.com
---
 doc/src/sgml/config.sgml | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 9a479f28e0..49037fb4a9 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5114,8 +5114,9 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
       </term>
       <listitem>
        <para>
-        Enables or disables the query planner's use of index-scan plan
-        types. The default is <literal>on</literal>.
+        Enables or disables the query planner's use of index-scan and
+        index-only-scan plan types.  The default is <literal>on</literal>.
+        Also see <xref linkend="guc-enable-indexonlyscan"/>.
        </para>
       </listitem>
      </varlistentry>
@@ -5130,7 +5131,9 @@ ANY <replaceable class="parameter">num_sync</replaceable> ( <replaceable class="
        <para>
         Enables or disables the query planner's use of index-only-scan plan
         types (see <xref linkend="indexes-index-only-scans"/>).
-        The default is <literal>on</literal>.
+        The default is <literal>on</literal>.  The
+        <xref linkend="guc-enable-indexscan"/> setting must also be
+        enabled to have the query planner consider index-only-scans.
        </para>
       </listitem>
      </varlistentry>