gp_segment_configuration
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, 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. | |
| san_mounts | int2vector | gp_san_ configuration.oid | An array of references to the gp_san_configuration table. Only used on systems that were initialized using sharred storage. |