pg_class

The catalog pg_class describes tables and other objects that have columns or are otherwise similar to a table.

Kind: System catalogs
Columns in this snapshot: 34
Definition source: English manual

Columns 34

Column	Type	Description / reference
`oid`	`oid`	Row identifier
`relname`	`name`	Name of the table, index, view, etc.
`relnamespace`	`oid`	The OID of the namespace that contains this relation pg_namespace.oid
`reltype`	`oid`	The OID of the data type that corresponds to this table's row type, if any; zero for indexes, sequences, and toast tables, which have no pg_type entry pg_type.oid
`reloftype`	`oid`	For typed tables, the OID of the underlying composite type; zero for all other relations pg_type.oid
`relowner`	`oid`	Owner of the relation pg_authid.oid
`relam`	`oid`	The access method used to access this table or index. Not meaningful if the relation is a sequence or has no on-disk file, except for partitioned tables, where, if set, it takes precedence over default_table_access_method when determining the access method to use for partitions created when one is not specified in the creation command. pg_am.oid
`relfilenode`	`oid`	Name of the on-disk file of this relation; zero means this is a “mapped” relation whose disk file name is determined by low-level state
`reltablespace`	`oid`	The tablespace in which this relation is stored. If zero, the database's default tablespace is implied. Not meaningful if the relation has no on-disk file, except for partitioned tables, where this is the tablespace in which partitions will be created when one is not specified in the creation command. pg_tablespace.oid
`relpages`	`int4`	Size of the on-disk representation of this table in pages (of size BLCKSZ). This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.
`reltuples`	`float4`	Number of live rows in the table. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX. If the table has never yet been vacuumed or analyzed, reltuples contains -1 indicating that the row count is unknown.
`relallvisible`	`int4`	Number of pages that are marked all-visible in the table's visibility map. This is only an estimate used by the planner. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.
`relallfrozen`	`int4`	Number of pages that are marked all-frozen in the table's visibility map. This is only an estimate used for triggering autovacuums. It can also be used along with relallvisible for scheduling manual vacuums and tuning vacuum's freezing behavior. It is updated by VACUUM, ANALYZE, and a few DDL commands such as CREATE INDEX.
`reltoastrelid`	`oid`	OID of the TOAST table associated with this table, zero if none. The TOAST table stores large attributes “out of line” in a secondary table.
`relhasindex`	`bool`	True if this is a table and it has (or recently had) any indexes
`relisshared`	`bool`	True if this table is shared across all databases in the cluster. Only certain system catalogs (such as pg_database) are shared.
`relpersistence`	`char`	p = permanent table/sequence, u = unlogged table/sequence, t = temporary table/sequence
`relkind`	`char`	r = ordinary table, i = index, S = sequence, t = TOAST table, v = view, m = materialized view, c = composite type, f = foreign table, p = partitioned table, I = partitioned index
`relnatts`	`int2`	Number of user columns in the relation (system columns not counted). There must be this many corresponding entries in pg_attribute. See also pg_attribute.attnum.
`relchecks`	`int2`	Number of CHECK constraints on the table; see pg_constraint catalog
`relhasrules`	`bool`	True if table has (or once had) rules; see pg_rewrite catalog
`relhastriggers`	`bool`	True if table has (or once had) triggers; see pg_trigger catalog
`relhassubclass`	`bool`	True if table or index has (or once had) any inheritance children or partitions
`relrowsecurity`	`bool`	True if table has row-level security enabled; see pg_policy catalog
`relforcerowsecurity`	`bool`	True if row-level security (when enabled) will also apply to table owner; see pg_policy catalog
`relispopulated`	`bool`	True if relation is populated (this is true for all relations other than some materialized views)
`relreplident`	`char`	Columns used to form “replica identity” for rows: d = default (primary key, if any), n = nothing, f = all columns, i = index with indisreplident set (same as nothing if the index used has been dropped)
`relispartition`	`bool`	True if table or index is a partition
`relrewrite`	`oid`	For new relations being written during a DDL operation that requires a table rewrite, this contains the OID of the original relation; otherwise zero. That state is only visible internally; this field should never contain anything other than zero for a user-visible relation.
`relfrozenxid`	`xid`	All transaction IDs before this one have been replaced with a permanent (“frozen”) transaction ID in this table. This is used to track whether the table needs to be vacuumed in order to prevent transaction ID wraparound or to allow pg_xact to be shrunk. Zero (InvalidTransactionId) if the relation is not a table.
`relminmxid`	`xid`	All multixact IDs before this one have been replaced by a transaction ID in this table. This is used to track whether the table needs to be vacuumed in order to prevent multixact ID wraparound or to allow pg_multixact to be shrunk. Zero (InvalidMultiXactId) if the relation is not a table.
`relacl`	`aclitem[]`	Access privileges; see Section 5.8 for details
`reloptions`	`text[]`	Access-method-specific options, as “keyword=value” strings
`relpartbound`	`pg_node_tree`	If table is a partition (see relispartition), internal representation of the partition bound

Column history across versions

Column	9.0	9.1	9.2	9.3	9.4	9.5	9.6	10	11	12	13	14	15	16	17	18	19	20
`oid`	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relname`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relnamespace`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reltype`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reloftype`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relowner`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relam`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relfilenode`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reltablespace`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relpages`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reltuples`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relallvisible`	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reltoastrelid`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relhasindex`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relisshared`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relpersistence`	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relkind`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relnatts`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relchecks`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relhasoids`	●	●	●	●	●	●	●	●	●	·	·	·	·	·	·	·	·	·
`relhaspkey`	●	●	●	●	●	●	●	●	·	·	·	·	·	·	·	·	·	·
`relhasrules`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relhastriggers`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relhassubclass`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relrowsecurity`	·	·	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●
`relforcerowsecurity`	·	·	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●
`relispopulated`	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relreplident`	·	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relispartition`	·	·	·	·	·	·	·	●	●	●	●	●	●	●	●	●	●	●
`relfrozenxid`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relminmxid`	·	·	·	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relacl`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`reloptions`	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●	●
`relpartbound`	·	·	·	·	·	·	·	●	●	●	●	●	●	●	●	●	●	●
`relrewrite`	·	·	·	·	·	·	·	·	●	●	●	●	●	●	●	●	●	●
`relallfrozen`	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·	●	●	●
`reltoastidxid`	●	●	●	●	·	·	·	·	·	·	·	·	·	·	·	·	·	·
`relistemp`	●	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·
`relhasexclusion`	●	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·	·

Version history 14

Definition snapshot: english-manuals:14579c6b8f62e0a9062b44f9a05… · English manual source