The SQL command SHOW allows you to see the current server configuration parameter settings. For example, to see the settings for all parameters:
$ psql -c 'SHOW ALL;'
SHOW lists the settings for the master instance only. To see the value of a particular parameter across the entire system (master and all segments), use the gpconfig utility. For example:
$ gpconfig --show max_connections
Parent topic: Configuring the Greenplum Database System
