Error Reporting and Logging
| pgpool-II 4.1.4 Documentation | |||
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5.6.1. Where To Log
- log_destination ( string )
-
Pgpool-II supports two destinations for logging the Pgpool-II messages. The supported log destinations are stderr and syslog . You can also set this parameter to a list of desired log destinations separated by commas if you want the log messages on the multiple destinations.
#for example to log on both syslog and stderr log_destination = 'syslog,stderr'The default is to log to stderr only.
Note: On some 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 . Pgpool-II can log to syslog facilities LOCAL0 through LOCAL7 (see syslog_facility ), but the default syslog configuration on most platforms will discard all such messages. You will need to add something like:
local0.* /var/log/pgpool.log
to the syslog daemon's configuration file to make it work.
This parameter can be changed by reloading the Pgpool-II configurations.
- syslog_facility ( enum )
-
See also the documentation of your system's syslog daemon. When logging to syslog is enabled, this parameter determines the syslog "facility" to be used. You can choose from LOCAL0 , LOCAL1 , LOCAL2 , LOCAL3 , LOCAL4 , LOCAL5 , LOCAL6 , LOCAL7 ; the default is LOCAL0 . See also the documentation of your system's syslog daemon.
This parameter can be changed by reloading the Pgpool-II configurations.
- syslog_ident ( string )
-
When logging to syslog is enabled, this parameter determines the program name used to identify Pgpool-II messages in syslog logs. The default is pgpool .
This parameter can be changed by reloading the Pgpool-II configurations.
5.6.2. When To Log
- client_min_messages ( enum )
-
Controls which minimum message levels are sent to the client. Valid values are DEBUG5 , DEBUG4 , DEBUG3 , DEBUG2 , DEBUG1 , LOG , NOTICE , WARNING and ERROR . Each level includes all the levels that follow it. The default is NOTICE .
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
- log_min_messages ( enum )
-
The default is WARNING. Controls which minimum message levels are emitted to log. Valid values are DEBUG5 , DEBUG4 , DEBUG3 , DEBUG2 , DEBUG1 , INFO , NOTICE , WARNING , ERROR , LOG , FATAL , and PANIC . Each level includes all the levels that follow it. The default is WARNING .
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
5.6.3. What To Log
- log_statement ( boolean )
-
Setting to on, prints all SQL statements to the log.
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
- log_per_node_statement ( boolean )
-
Similar to log_statement , except that it print the logs for each DB node separately. It can be useful to make sure that replication or load-balancing is working.
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
- log_client_messages ( boolean )
-
Setting to on, prints client messages to the log.
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
- log_hostname ( boolean )
-
Setting to on, prints the hostname instead of IP address in the ps command result, and connection logs (when log_connections is on).
This parameter can be changed by reloading the Pgpool-II configurations.
- log_connections ( boolean )
-
Setting to on, prints all client connections from to the log.
This parameter can be changed by reloading the Pgpool-II configurations.
- log_error_verbosity ( enum )
-
Controls the amount of detail emitted for each message that is logged. Valid values are TERSE , DEFAULT , and VERBOSE , each adding more fields to displayed messages. TERSE excludes the logging of DETAIL , HINT , and CONTEXT error information.
This parameter can be changed by reloading the Pgpool-II configurations. You can also use PGPOOL SET command to alter the value of this parameter for a current session.
- log_line_prefix ( string )
-
This is a
printf-style string that is output at the beginning of each log line. % characters begin "escape sequences" that are replaced with information outlined below. All unrecognized escapes are ignored. Other characters are copied straight to the log line. Default is '%t: pid %p: ', which prints timestamp and process id, which keeps backward compatibility with pre Pgpool-II V3.4 .Table 5-5. log_line_prefix escape options
Escape Effect %a Client application name %p Process ID (PID) %P Process name %t Time stamp %d Database name %u User name %l Log line number for each process %% '%' character This parameter can be changed by reloading the Pgpool-II configurations.