gp_persistent_relfile_node
The gp_persistent_relfile_node table keeps track of the status of file system objects in relation to the transaction status of database objects. This information is used to make sure the state of the system catalogs and the file system files persisted to disk are synchronized.
Table 1. pg_catalog.gp_persistent_relfile_node
| column | type | references | description |
|---|---|---|---|
tablespace_oid |
oid | pg_tablespace.oid | Tablespace object id |
database_oid |
oid | pg_database.oid | Database object id |
relfilenode_oid |
oid | pg_class.relfilenode | The object id of the relation file node. |
segment_file_num |
integer | ||
relation_storage_manager |
smallint | ||
persistent_state |
smallint | 0 - free
1 - create pending 2 - created 3 - drop pending 4 - aborting create 5 - “Just in Time” create pending 6 - bulk load create pending |
|
relation_bufpool_kind |
integer | ||
parent_xid |
integer | Global transaction id. | |
persistent_serial_num |
bigint | Log sequence number position in the transaction log for a file block. | |
previous_free_tid |
tid | Used by HAWQ to internally manage persistent representations of file system objects. |