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Add a <tip> that log_line_prefix should usually end with a space to 

provide visual separation from the rest of the log line; I've been
noticing lately that quite a few newbies fail to figure this out for
themselves.  Also a little editorial cleanup of the log_line_prefix
description.
This commit is contained in:
Tom Lane 2007-06-22 16:15:23 +00:00
parent 2128e5c392
commit ec0bb02db8
1 changed files with 36 additions and 19 deletions
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55
doc/src/sgml/config.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.127 2007/06/19 20:13:21 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/config.sgml,v 1.128 2007/06/22 16:15:23 tgl Exp $ -->
<chapter Id="runtime-config">
<title>Server Configuration</title>
@ -2774,17 +2774,15 @@ SELECT * FROM parent WHERE key = 2400;
<listitem>
<para>
This is a <function>printf</>-style string that is output at the
beginning of each log line. The default is an empty string.
Each recognized escape is replaced as outlined
below - anything else that looks like an escape is ignored. Other
beginning of each log line.
<literal>%</> characters begin <quote>escape sequences</>
that are replaced with status information as outlined below.
Unrecognized escapes are ignored. Other
characters are copied straight to the log line. Some escapes are
only recognized by session processes, and do not apply to
background processes such as the main server process. <application>Syslog</>
produces its own
time stamp and process ID information, so you probably do not want to
use those escapes if you are using <application>syslog</>.
background processes such as the main server process.
This parameter can only be set in the <filename>postgresql.conf</>
file or on the server command line.
file or on the server command line. The default is an empty string.
<informaltable>
<tgroup cols="3">
@ -2823,7 +2821,7 @@ SELECT * FROM parent WHERE key = 2400;
</row>
<row>
<entry><literal>%t</literal></entry>
<entry>Time stamp (no milliseconds, no timezone on Windows)</entry>
<entry>Time stamp without milliseconds (no timezone either on Windows)</entry>
<entry>no</entry>
</row>
<row>
@ -2833,16 +2831,12 @@ SELECT * FROM parent WHERE key = 2400;
</row>
<row>
<entry><literal>%i</literal></entry>
<entry>Command tag: This is the command that generated the log line.</entry>
<entry>Command tag: type of session's current command</entry>
<entry>yes</entry>
</row>
<row>
<entry><literal>%c</literal></entry>
<entry>Session ID: A unique identifier for each session.
It is 2 4-byte hexadecimal numbers (without leading zeros)
separated by a dot. The numbers
are the session start time and the process ID, so this can also
be used as a space saving way of printing these items.</entry>
<entry>Session ID: see below</entry>
<entry>yes</entry>
</row>
<row>
@ -2862,9 +2856,9 @@ SELECT * FROM parent WHERE key = 2400;
</row>
<row>
<entry><literal>%q</literal></entry>
<entry>Does not produce any output, but tells non-session
processes to stop at this point in the string. Ignored by
session processes.</entry>
<entry>Produces no output, but tells non-session
processes to stop at this point in the string; ignored by
session processes</entry>
<entry>no</entry>
</row>
<row>
@ -2875,7 +2869,30 @@ SELECT * FROM parent WHERE key = 2400;
</tbody>
</tgroup>
</informaltable>
The <literal>%c</> escape prints a quasi-unique session identifier,
consisting of two 4-byte hexadecimal numbers (without leading zeros)
separated by a dot. The numbers are the session start time and the
process ID, so <literal>%c</> can also be used as a space saving way
of printing those items.
</para>
<tip>
<para>
If you set a nonempty value for <varname>log_line_prefix</>,
you should usually make its last character be a space, to provide
visual separation from the rest of the log line. A punctuation
character could be used too.
</para>
</tip>
<tip>
<para>
<application>Syslog</> produces its own
time stamp and process ID information, so you probably do not want to
use those escapes if you are logging to <application>syslog</>.
</para>
</tip>
</listitem>
</varlistentry>