diff options
| -rw-r--r-- | doc/src/sgml/config.sgml | 55 |
1 files changed, 36 insertions, 19 deletions
diff --git a/doc/src/sgml/config.sgml b/doc/src/sgml/config.sgml index 1d806bf1b73..a38b02fd211 100644 --- a/doc/src/sgml/config.sgml +++ b/doc/src/sgml/config.sgml @@ -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> |