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By default, set log_line_prefix = '%m [%p] '.

This value might not be to everyone's taste; in particular, some
people might prefer %t to %m, and others may want %u, %d, or other
fields.  However, it's a vast improvement on the old default of ''.

Christoph Berg
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robertmhaas committed Oct 17, 2016
1 parent 5ff4a67 commit 7d3235ba42f8d5fc70c58e242702cc5e2e3549a6
Showing with 15 additions and 3 deletions.
  1. +13 −1 doc/src/sgml/config.sgml
  2. +1 −1 src/backend/utils/misc/guc.c
  3. +1 −1 src/backend/utils/misc/postgresql.conf.sample
@@ -5004,7 +5004,8 @@ local0.* /var/log/postgresql
value will pad on the left. Padding can be useful to aid human
readability in log files.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line. The default is an empty string.
file or on the server command line. The default is
<literal>'%m [%p] '</> which logs a time stamp and the process ID.

<informaltable>
<tgroup cols="3">
@@ -5142,6 +5143,17 @@ FROM pg_stat_activity;
include those escapes if you are logging to <application>syslog</>.
</para>
</tip>

<tip>
<para>
The <literal>%q</> escape is useful when including information that is
only available in session (backend) context like user or database
name. For example:
<programlisting>
log_line_prefix = '%m [%p] %q%u@%d/%a '
</programlisting>
</para>
</tip>
</listitem>
</varlistentry>

@@ -3014,7 +3014,7 @@ static struct config_string ConfigureNamesString[] =
gettext_noop("If blank, no prefix is used.")
},
&Log_line_prefix,
"",
"%m [%p] ",
NULL, NULL, NULL
},

@@ -430,7 +430,7 @@
#log_duration = off
#log_error_verbosity = default # terse, default, or verbose messages
#log_hostname = off
#log_line_prefix = '' # special values:
#log_line_prefix = '%m [%p] ' # special values:
# %a = application name
# %u = user name
# %d = database name

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