gp_segment_configuration

The gp_segment_configuration table contains information about mirroring and segment instance configuration.

column	type	references	description
dbid	smallint		Unique identifier of a segment (or coordinator) instance.
content	smallint		The content identifier for a segment instance. A primary segment instance and its corresponding mirror will always have the same content identifier. For a segment the value is from 0 to N-1, where N is the number of primary segments in the system. For the coordinator, 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 coordinator segment and s for the standby coordinator segment, but these values do not describe the synchronization state for the coordinator segment. Use gp_stat_replication to determine the synchronization state between the coordinator and standby coordinator.
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.

Parent topic: System Catalogs Definitions