tpch1000s=# SELECT * FROM gp_segment_configuration order by dbid;
 dbid | content | role | preferred_role | mode | status | port | hostname | address |         datadir          
------+---------+------+----------------+------+--------+------+----------+---------+--------------------------
    1 |      -1 | p    | p              | n    | u      | 7456 | test-4   | gp10g_7 | /opt/gp/gpmaster/gpseg-1
    2 |       0 | p    | p              | n    | u      | 6345 | test-1   | gp10g_4 | /opt/gp/gpdata/gpseg0
    3 |       1 | p    | p              | n    | u      | 6346 | test-1   | gp10g_4 | /opt/gp/gpdata/gpseg1
    4 |       2 | p    | p              | n    | u      | 6347 | test-1   | gp10g_4 | /opt/gp/gpdata/gpseg2