The catalog pg_transform stores information about transforms, which are a mechanism to adapt data types to procedural languages. See

The catalog pg_aggregate stores information about aggregate functions. An aggregate function is a function that operates on a set of values

The pg_prepared_statements view displays all the prepared statements that are available in the current session. See

The catalog pg_description stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the

The view pg_tables provides access to useful information about each table in the database.

The catalog pg_largeobject holds the data making up "large objects". A large object is identified by an OID assigned

The view pg_config describes the compile-time configuration parameters of the currently installed version of PostgreSQL

The catalog pg_auth_members shows the membership relations between roles. Any non-circular set of relationships is allowed.

The catalog pg_range stores information about range types. This is in addition to the types' entries in

The catalog pg_namespace stores namespaces. A namespace is the structure underlying SQL schemas: each namespace can have a separate collection