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Replace log_filename_prefix with more general log_filename parameter,

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to allow DBA to choose the form in which log filenames reflect the
current time.  Also allow for truncating instead of appending to
pre-existing files --- this is convenient when the log filename pattern
rewrites the same names cyclically.  Per Ed L.
This commit is contained in:
Tom Lane
2004-08-31 04:53:44 +00:00
parent 25aba1cafd
commit 8c603f2c95
5 changed files with 166 additions and 67 deletions
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39
doc/src/sgml/runtime.sgml
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@ -1,5 +1,5 @@
<!--
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.279 2004/08/24 00:06:50 neilc Exp $
$PostgreSQL: pgsql/doc/src/sgml/runtime.sgml,v 1.280 2004/08/31 04:53:43 tgl Exp $
-->
<Chapter Id="runtime">
@ -1925,14 +1925,21 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Win32
</listitem>
</varlistentry>
<varlistentry id="guc-log-filename-prefix" xreflabel="log_filename_prefix">
<term><varname>log_filename_prefix</varname> (<type>string</type>)</term>
<varlistentry id="guc-log-filename" xreflabel="log_filename">
<term><varname>log_filename</varname> (<type>string</type>)</term>
<listitem>
<para>
When <varname>redirect_stderr</> is enabled, this option
sets the prefix of the file names of the created log files.
The postmaster PID and the current time are appended to this
prefix to form an exact log file name.
sets the file names of the created log files. The value
is treated as a <systemitem>strftime</> pattern,
so <literal>%</>-escapes
can be used to specify time-varying file names.
If no <literal>%</>-escapes are present,
<productname>PostgreSQL</productname> will
append the epoch of the new log file's open time. For example,
if <varname>log_filename</> were <literal>server_log</>, then the
chosen file name would be <literal>server_log.1093827753</>
for a log starting at Sun Aug 29 19:02:33 2004 MST.
This option can only be set at server start or in the
<filename>postgresql.conf</filename> configuration file.
</para>
@ -1969,6 +1976,26 @@ archive_command = 'copy "%p" /mnt/server/archivedir/"%f"' # Win32
</listitem>
</varlistentry>
<varlistentry id="guc-log-truncate-on-rotation" xreflabel="log_truncate_on_rotation">
<term><varname>log_truncate_on_rotation</varname> (<type>boolean</type>)</term>
<listitem>
<para>
When <varname>redirect_stderr</> is enabled, this option will cause
<productname>PostgreSQL</productname> to truncate (overwrite),
rather than append to, any existing log file of the same name.
However, truncation will occur only when a new file is being opened
due to time-based rotation, not during server startup or size-based
rotation. When false, pre-existing files will be appended to in
all cases. For example, using this option in combination with
a <varname>log_filename</> like <literal>postgresql-%H.log</>
would result in generating twenty-four hourly log files and then
cyclically overwriting them.
This option can only be set at server start or in the
<filename>postgresql.conf</filename> configuration file.
</para>
</listitem>
</varlistentry>
<varlistentry id="guc-syslog-facility" xreflabel="syslog_facility">
<term><varname>syslog_facility</varname> (<type>string</type>)</term>
<listitem>