# gp_relfile_node

The gp_relfile_node table contains information about the file system objects for a relation (table, view, index, and so on).



Table 1. `pg_catalog.gp_relation_node`

| column                  | type    | references                    | description                                                  |
| :---------------------- | :------ | :---------------------------- | :----------------------------------------------------------- |
| `relfilenode_oid`       | oid     | pg_class_internal.relfilenode | The object id of the relation file node.                     |
| `segment_file_num`      | integer |                               | For append-only tables, the append-only segment file number. |
| `persistent_tid`        | tid     |                               | Used by OushuDB  to internally manage persistent representations of file system objects. |
| `persistent_serial_num` | bigint  |                               | Log sequence number position  for a file block.              |