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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 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 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 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. |
Parent topic: System Catalogs Definitions
