From: Bruce Momjian <bruce@momjian.us>
Date: Thu, 14 Jul 2022 19:17:19 +0000 (-0400)
Subject: doc:  mention that INSERT can block because of unique indexes
X-Git-Tag: REL_12_12~37
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=ac480b074f4ebad1ae8947b1eeb9790e8925f94e;p=thirdparty%2Fpostgresql.git

doc:  mention that INSERT can block because of unique indexes

Initial patch by David G. Johnston.

Reported-by: David G. Johnston

Discussion: https://postgr.es/m/CAKFQuwZpbdzceO41VE-xt1Xh8rWRRfgopTAK1wL9EhCo0Am-Sw@mail.gmail.com

Backpatch-through: 10
---

diff --git a/doc/src/sgml/ref/insert.sgml b/doc/src/sgml/ref/insert.sgml
index e829c61642d..f2da16867d2 100644
--- a/doc/src/sgml/ref/insert.sgml
+++ b/doc/src/sgml/ref/insert.sgml
@@ -75,6 +75,11 @@ INSERT INTO <replaceable class="parameter">table_name</replaceable> [ AS <replac
   </para>
 
   <para>
+   <command>INSERT</command> into tables that lack unique indexes will
+   not be blocked by concurrent activity.  Tables with unique indexes
+   might block if concurrent sessions perform actions that lock or modify
+   rows matching the unique index values being inserted;  the details
+   are covered in <xref linkend="index-unique-checks"/>.
    <literal>ON CONFLICT</literal> can be used to specify an alternative
    action to raising a unique constraint or exclusion constraint
    violation error. (See <xref linkend="sql-on-conflict"