The catalog pg_description stores optional descriptions (comments) for each database object. Descriptions can be manipulated with the COMMENT command and viewed with psql 's \d commands. Descriptions of many built-in system objects are provided in the initial contents of pg_description .

See also pg_shdescription , which performs a similar function for descriptions involving objects that are shared across a database cluster.

Table 49-19. pg_description Columns

Name Type References Description
objoid oid any OID column The OID of the object this description pertains to
classoid oid pg_class .oid The OID of the system catalog this object appears in
objsubid int4 For a comment on a table column, this is the column number (the objoid and classoid refer to the table itself). For all other object types, this column is zero.
description text Arbitrary text that serves as the description of this object