PG_PARTITION

PG_PARTITION records all partitioned tables, table partitions, TOAST tables on table partitions, and index partitions in the database. Partitioned index information is not stored in the system catalog PG_PARTITION.

Table 1 PG_PARTITION columns

Name	Type	Description
oid	oid	Row identifier (hidden attribute, which must be specified)
relname	name	Names of the partitioned tables, table partitions, TOAST tables on table partitions, and index partitions
parttype	"char"	Object type - r: partitioned table - p: table partition - x: index partition - t: TOAST table
parentid	oid	OID of the partitioned table in PG_CLASS when the object is a partitioned table or table partition OID of the partitioned index when the object is an index partition
rangenum	integer	Reserved
intervalnum	integer	Reserved
partstrategy	"char"	Partition policy of the partitioned table - r: range partition - v: numeric partition - i: interval partition
relfilenode	oid	Physical storage locations of the table partition, index partition, and TOAST table on the table partition
reltablespace	oid	OID of the tablespace containing the table partition, index partition, and TOAST table on the table partition
relpages	double precision	Statistics: numbers of data pages of the table partition and index partition
reltuples	double precision	Statistics: numbers of tuples of the table partition and index partition
relallvisible	integer	Statistics: number of visible data pages of the table partition and index partition
reltoastrelid	oid	OID of the TOAST table corresponding to the table partition
reltoastidxid	oid	OID of the TOAST table index corresponding to the table partition
indextblid	oid	OID of the table partition corresponding to the index partition
indisusable	Boolean	Whether the index partition is available
reldeltarelid	oid	OID of a Delta table
reldeltaidx	oid	OID of the index for a Delta table
relcudescrelid	oid	OID of a CU description table
relcudescidx	oid	OID of the index for a CU description table
relfrozenxid	xid32	Frozen transaction ID To ensure forward compatibility, this column is reserved. The relfrozenxid64 column is added to record the information.
intspnum	integer	Number of tablespaces that the interval partition belongs to
partkey	int2vector	Column number of the partition key
intervaltablespace	oidvector	Tablespace that the interval partition belongs to. Interval partitions fall in the tablespaces in the round-robin manner.
interval	text[]	Interval value of the interval partition
boundaries	text[]	Upper boundary of the range partition and interval partition
transit	text[]	Transit of the interval partition
reloptions	text[]	Storage property of a partition used for collecting online scale-out information. Same as pg_class.reloptions, it is expressed in a string in the format of keyword=value.
relfrozenxid64	xid	Frozen transaction ID