gp_persistent_relfile_node

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.