pg_shdescription stores optional
descriptions (comments) for shared database objects. Descriptions can be
manipulated with the COMMENT command and viewed with
which performs a similar function for descriptions involving objects
within a single database.
Unlike most system catalogs,
is shared across all databases of a cluster: there is only one
pg_shdescription per cluster, not
one per database.
The OID of the object this description pertains to
The OID of the system catalog this object appears in
Arbitrary text that serves as the description of this object