oid oid
Row identifier
relname name
Name of the table, index, view, etc.
relnamespace oid (references pg_namespace.oid)
The OID of the namespace that contains this relation
reltype oid (references pg_type.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
reloftype oid (references pg_type.oid)
For typed tables, the OID of the underlying composite type; zero for all other relations
relowner oid (references pg_authid.oid)
Owner of the relation
relam oid (references pg_am.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.
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 (references pg_tablespace.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.
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 (references pg_class.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 (references pg_class.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
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