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-rw-r--r--doc/src/sgml/config.sgml6
-rw-r--r--doc/src/sgml/release-9.3.sgml8
2 files changed, 3 insertions, 11 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml
index 7b3e6179470..d750f0800b7 100644
--- a/doc/src/sgml/config.sgml
+++ b/doc/src/sgml/config.sgml
@@ -4089,14 +4089,14 @@ local0.* /var/log/postgresql
</informaltable>
The <literal>%c</> escape prints a quasi-unique session identifier,
- consisting of two 4-byte hexadecimal numbers separated by a dot.
- The numbers are the process start time and the
+ consisting of two 4-byte hexadecimal numbers (without leading zeros)
+ separated by a dot. The numbers are the process start time and the
process ID, so <literal>%c</> can also be used as a space saving way
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) || '.' ||
- regexp_replace('0000' || '0133e3', '^0*(.{4,})$', '\1')
+ to_hex(pid)
FROM pg_stat_activity;
</programlisting>
diff --git a/doc/src/sgml/release-9.3.sgml b/doc/src/sgml/release-9.3.sgml
index 32839b7d2f1..d64e8e357f1 100644
--- a/doc/src/sgml/release-9.3.sgml
+++ b/doc/src/sgml/release-9.3.sgml
@@ -78,14 +78,6 @@
</para>
</listitem>
- <listitem>
- <para>
- Have <quote>session id</> (<literal>%c</>) in <link
- linkend="guc-log-line-prefix"><varname>log_line_prefix</></link>
- always output at least four hex digits after the period (Bruce Momjian)
- </para>
- </listitem>
-
</itemizedlist>
</sect3>