## 51.47. `pg_shdescription`

The catalog `pg_shdescription` stores optional descriptions (comments) for shared database objects. Descriptions can be manipulated with the COMMENT command and viewed with psql's `\d` 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 cluster: there is only one copy of `pg_shdescription` per cluster, not one per database.

Table 51.47. `pg_shdescription` Columns

Column Type Description
`objoid` `oid` (references any OID column) The OID of the object this description pertains to
`classoid` `oid` (references `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