From: Robert Haas <rhaas@postgresql.org>
Date: Thu, 4 Jun 2015 21:57:39 +0000 (-0400)
Subject: doc: Session identifiers truncate, not round, the backend start time.
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doc: Session identifiers truncate, not round, the backend start time.

Joel Jacobson
---

diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 5549b7dce62..1da7dfbc5cd 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -4707,7 +4707,7 @@ local0.*    /var/log/postgresql
          of printing those items.  For example, to generate the session
          identifier from <literal>pg_stat_activity</>, use this query:
 <programlisting>
-SELECT to_hex(EXTRACT(EPOCH FROM backend_start)::integer) || '.' ||
+SELECT to_hex(trunc(EXTRACT(EPOCH FROM backend_start))::integer) || '.' ||
        to_hex(pid)
 FROM pg_stat_activity;
 </programlisting>