The gp_persistent_database_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_database_node

column type references description
tablespace_oid oid pg_tablespace.oid Table space object id.
database_oid oid pg_database.oid Database object id.
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

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.