| relname | name | | Name of the table, index, view, etc. |
| relnamespace | oid | pg_namespace.oid | The OID of the namespace that contains this relation
|
| reltype | oid | pg_type.oid | The OID of the data type that corresponds to this table's row type,
if any (zero for indexes, which have no pg_type entry)
|
| relowner | oid | pg_authid.oid | Owner of the relation |
| relam | oid | pg_am.oid | If this is an index, the access method used (B-tree, hash, etc.) |
| relfilenode | oid | | Name of the on-disk file of this relation; 0 if none |
| reltablespace | oid | 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.)
|
| 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 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
|
| reltoastrelid | oid | pg_class.oid | OID of the TOAST table associated with this table, 0 if none. The
TOAST table stores large attributes "out of line" in a
secondary table
|
| reltoastidxid | oid | pg_class.oid | For a TOAST table, the OID of its index. 0 if not a TOAST table
|
| relhasindex | bool | | True if this is a table and it has (or recently had) any
indexes. This is set by CREATE INDEX, but
not cleared immediately by DROP INDEX.
VACUUM clears relhasindex if it finds the
table has no 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
|
| relkind | char | | r = ordinary table, i = index,
S = sequence, v = view, c =
composite type, t = TOAST
table
|
| 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
|
| reltriggers | int2 | | Number of triggers on the table; see
pg_trigger catalog
|
| relukeys | int2 | | Unused (not the number of unique keys) |
| relfkeys | int2 | | Unused (not the number of foreign keys on the table) |
| relrefs | int2 | | Unused |
| relhasoids | bool | | True if we generate an OID for each row of the relation
|
| relhaspkey | bool | | True if the table has (or once had) a primary key
|
| relhasrules | bool | | True if table has rules; see
pg_rewrite catalog
|
| relhassubclass | bool | | True if table has (or once had) any inheritance children |
| 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_clog to be shrunk. Zero
(InvalidTransactionId) if the relation is not a table
|
| relacl | aclitem[] | | Access privileges; see
GRANT and
REVOKE
for details
|
| reloptions | text[] | | Access-method-specific options, as "keyword=value" strings
|
