The following parameters must be uncommented and set in the server configuration file (postgresql.conf) in order to enable the Command Center data collection agents:

• gp_enable_gpperfmon and gpperfmon_port must be set in both the master and segment postgresql.conf files.
• gp_enable_gpperfmon and gp_enable_gpperfmon only need to be set in the master postgresql.conf file.

After changing these settings, the Greenplum Database instance must be restarted for the changes to take effect.

gp_enable_gpperfmon

Turns on the Command Center data collection agent for a segment. Must be set in all postgresql.conf files (master and all segments).

gpperfmon_port

The default port for the Command Center agents is 8888, but you can set this parameter to a different port if required (master and all segments).

gp_gpperfmon_send_interval

Sets the frequency in seconds that the Greenplum Database server processes send query execution updates to the Command Center agent processes.

gp_external_enable_exec

This parameter is enabled by default and must remain enabled. It allows the use of external tables that execute OS commands or scripts on the segment hosts. The Command Center agents use this type of external tables to collect current system metrics from the segments.

gpperfmon_log_alert_level

Controls which message levels are written to the gpperfmon log. Each level includes all the levels that follow it. The later the level, the fewer messages are sent to the log. The default value is warning.