doc: fix reference for finding replication slots to drop

Commit a70bce43fb added instructions on how to recover if PostgreSQL
refuses to issue new transaction IDs because of imminent wraparound,
but when describing how to find replication slots that should be dropped,
it referred to pg_stat_replication where it should have referenced
pg_replication_slots.

In passing, decorate references to views with <structname> tags.

Backpatch to all supported versions.

Reported-By: Sanjaya Waruna <sanjaya.waruna@gmail.com>
Author: Laurenz Albe <laurenz.albe@cybertec.at>
Reviewed-by: Robert Treat <rob@xzilla.net>
Reviewed-by: Fujii Masao <masao.fujii@gmail.com>
Discussion: https://postgr.es/m/176767268098.1084085.10345048667224193115@wrigleys.postgresql.org
Backpatch-through: 14

diff --git a/doc/src/sgml/maintenance.sgml b/doc/src/sgml/maintenance.sgml
index b81a5806eb6d3bda4bb7923190e544bbd1393e58..356e826ff16d7b189dd660a0a7d01ad028f1a31a 100644 (file)
--- a/doc/src/sgml/maintenance.sgml
+++ b/doc/src/sgml/maintenance.sgml
@@ -683,20 +683,20 @@ HINT:  Execute a database-wide VACUUM in that database.
     <orderedlist>
      <listitem>
       <simpara>Resolve old prepared transactions. You can find these by checking
-       <link linkend="view-pg-prepared-xacts">pg_prepared_xacts</link> for rows where
+       <link linkend="view-pg-prepared-xacts"><structname>pg_prepared_xacts</structname></link> for rows where
        <literal>age(transactionid)</literal> is large. Such transactions should be
        committed or rolled back.</simpara>
      </listitem>
      <listitem>
       <simpara>End long-running open transactions. You can find these by checking
-       <link linkend="monitoring-pg-stat-activity-view">pg_stat_activity</link> for rows where
+       <link linkend="monitoring-pg-stat-activity-view"><structname>pg_stat_activity</structname></link> for rows where
        <literal>age(backend_xid)</literal> or <literal>age(backend_xmin)</literal> is
        large. Such transactions should be committed or rolled back, or the session
        can be terminated using <literal>pg_terminate_backend</literal>.</simpara>
      </listitem>
      <listitem>
       <simpara>Drop any old replication slots. Use
-       <link linkend="monitoring-pg-stat-replication-view">pg_stat_replication</link> to
+       <link linkend="view-pg-replication-slots"><structname>pg_replication_slots</structname></link> to
        find slots where <literal>age(xmin)</literal> or <literal>age(catalog_xmin)</literal>
        is large. In many cases, such slots were created for replication to servers that no
        longer exist, or that have been down for a long time. If you drop a slot for a server