PG_NAMESPACE

PG_NAMESPACE records the namespaces, that is, schema-related information. The nsptype column is added to the cloud native data warehouse 3.0 to distinguish external schemas from common schemas. The value of external schema is e, and the value of common schema is i.

**Table 1** PG_NAMESPACE columns
Column	Type	Description
nspname	name	Name of the namespace
nspowner	oid	Owner of the namespace
nsptimeline	bigint	Timeline when the namespace is created on the DN This column is for internal use and valid only on the DN.
nspacl	aclitem[]	Access permissions. For details, see GRANT and REVOKE.
permspace	bigint	Quota of a schema's permanent tablespace
usedspace	bigint	Used size of a schema's permanent tablespace
nsptype	char	Distinguishes external schemas from common schemas.