Help Center/ Data Warehouse Service / Developer Guide/ Developer Guide (9.1.1.x)/ DWS System Catalogs and Views/ System Catalogs/ PG_DB_FILE

Updated on 2025-10-10 GMT+08:00

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PG_DB_FILE

PG_DB_FILE stores file information of V3 tables and creates unique indexes for the databaseid, tablespaceid, relfilenode, and fileid columns. Update of this system catalog is controlled by the enable_pg_db_file parameter. This system catalog is supported only by clusters of version 9.1.1.100 or later.

**Table 1** PG_DB_FILE columns
Column	Type	Description
databaseid	Oid	Database OID
tablespaceid	Oid	Tablespace OID
relfilenode	Oid	Table relfilenode
fileid	int8	File ID
type	char	Data type. Four types are available: CUDESC, CU, DELTA, and ROW. Currently, only CU data is collected.
refcount	int8	Used for zero copy
filesize	int8	File size
ancestor	int8	Used for zero copy
xid	TransactionId	Transaction ID

Parent Topic: System Catalogs

Previous topic: PG_DB_ROLE_SETTING

Next topic: PG_DEFAULT_ACL

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