(On Microsoft Windows this parameter is ignored.) The parameter value is expected to be a numeric mode specified in the format accepted by the chmod and umask system calls. On Unix systems this parameter sets the permissions for log files when logging_collector is enabled. This parameter can only be set in the nf file or on the server command line. json will be appended to the timestamped log file name to create the file name for JSON-format output. If JSON-format output is enabled in log_destination. csv will be appended to the timestamped log file name to create the file name for CSV-format output. If CSV-format output is enabled in log_destination. In releases prior to 8.4, if no % escapes were present, PostgreSQL would append the epoch of the new log file's creation time, but this is no longer the case. If you specify a file name without escapes, you should plan to use a log rotation utility to avoid eventually filling the entire disk. The default is postgresql-%Y-%m-%d_%H%M%S.log. Note that the system's strftime is not used directly, so platform-specific (nonstandard) extensions do not work. (Note that if there are any time-zone-dependent %-escapes, the computation is done in the zone specified by log_timezone.) The supported %-escapes are similar to those listed in the Open Group's strftime specification. The value is treated as a strftime pattern, so %-escapes can be used to specify time-varying file names. When logging_collector is enabled, this parameter sets the file names of the created log files. It can be specified as an absolute path, or relative to the cluster data directory. When logging_collector is enabled, this parameter determines the directory in which log files will be created. In contrast, syslog prefers to drop messages if it cannot write them, which means it may fail to log some messages in such cases but it will not block the rest of the system. This means that in case of extremely high load, server processes could be blocked while trying to send additional log messages when the collector has fallen behind. The logging collector is designed to never lose messages. (One common example is dynamic-linker failure messages another is error messages produced by scripts such as archive_command.) This parameter can only be set at server start. This approach is often more useful than logging to syslog, since some types of messages might not appear in syslog output. This parameter enables the logging collector, which is a background process that captures log messages sent to stderr and redirects them into log files. On Windows, when you use the eventlog option for log_destination, you should register an event source and its library with the operating system so that the Windows Event Viewer can display event log messages cleanly. To the syslog daemon's configuration file to make it work. PostgreSQL can log to syslog facilities LOCAL0 through LOCAL7 (see syslog_facility), but the default syslog configuration on most platforms will discard all such messages. On most Unix systems, you will need to alter the configuration of your system's syslog daemon in order to make use of the syslog option for log_destination. It is removed when none of stderr, csvlog or jsonlog are included in log_destination, and when the logging collector is disabled. Here is an example of this file's content:Ĭurrent_logfiles is recreated when a new log file is created as an effect of rotation, and when log_destination is reloaded. This provides a convenient way to find the logs currently in use by the instance. When either stderr, csvlog or jsonlog are included, the file current_logfiles is created to record the location of the log file(s) currently in use by the logging collector and the associated logging destination. logging_collector must be enabled to generate JSON-format log output. If jsonlog is included in log_destination, log entries are output in JSON format, which is convenient for loading logs into programs. logging_collector must be enabled to generate CSV-format log output. If csvlog is included in log_destination, log entries are output in “ comma separated value” ( CSV) format, which is convenient for loading logs into programs. Set this parameter to a list of desired log destinations separated by commas. PostgreSQL supports several methods for logging server messages, including stderr, csvlog, jsonlog, and syslog.
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