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The SHOW SQL command allows you to see the settings of the server configuration parameters used by the Greenplum Database system. For example, to see the settings for all parameters:
$ psql -c 'SHOW ALL;'
Running SHOW will show the settings for the master instance only. If you want to see the value of a particular parameter across the entire system (master and all segments), you can use the gpconfig utility. For example:
$ gpconfig --show max_connections