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The pg_shdescription system catalog table stores optional descriptions (comments) for shared database objects. Descriptions can be manipulated with the COMMENT command and viewed with psql's \d meta-commands. See also pg_description, which performs a similar function for descriptions involving objects within a single database. Unlike most system catalogs, pg_shdescription is shared across all databases of a Greenplum system: there is only one copy of pg_shdescription per system, not one per database.
|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|
|description||text||Arbitrary text that serves as the description of this object.|