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The gp_segment_configuration table contains information about mirroring and segment configuration.
| column | type | references | description |
|---|---|---|---|
dbid | smallint | The 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-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 with its mirror copy. Values are s (synchronized), c (change logging), or r (resyncing). | |
status | char | The fault status of a segment. 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 on a segment host. This value may be the same as hostname in systems upgraded from 3.x or on systems that do not have per-interface hostnames configured. | |
replication_port | integer | The TCP port the file block replication process is using to keep primary and mirror segments synchronized. |
Parent topic: System Catalogs Definitions
