From: David Rowley <drowley@postgresql.org>
Date: Tue, 29 Oct 2024 03:25:08 +0000 (+1300)
Subject: Doc: clarify enable_indexscan=off also disabled Index Only Scans
X-Git-Tag: REL_16_5~31
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=4f47ee03d5f8adad0da40f650a165393b49cbcf1;p=thirdparty%2Fpostgresql.git

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
---

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 18c104f079f..386dab08e92 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -5226,8 +5226,9 @@ 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>
@@ -5242,7 +5243,9 @@ 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>