The gp_segment_configuration table contains information about mirroring and segment instance configuration.
|dbid||smallint||Unique identifier of a segment (or master) instance.|
|content||smallint||The content identifier for a segment instance. A primary segment
instance and its corresponding mirror will always have the same content
For a segment the value is from 0 to N-1, where N is the number of primary segments in the system.
For the master, the value is always -1.
|role||char||The role that a segment is currently running as. Values are p (primary) or m(mirror).|
|preferred_role||char||The role that a segment was originally assigned at initialization time. Values are p (primary) or m (mirror).|
|mode||char||The synchronization status of a segment instance with its mirror
copy. Values are s (Synchronized) or n (Not In Sync).
Note: This column always shows n for the master segment and s for the standby master segment, but these values do not describe the synchronization state for the master segment. Use gp_stat_replication to determine the synchronization state between the master and standby master.
|status||char||The fault status of a segment instance. Values are u (up) or d (down).|
|port||integer||The TCP port the database server listener process is using.|
|hostname||text||The hostname of a segment host.|
|address||text||The hostname used to access a particular segment instance on a segment host. This value may be the same as hostname on systems that do not have per-interface hostnames configured.|
|datadir||text||Segment instance data directory.|