| Postgres-XC 1.2 Documentation | ||||
|---|---|---|---|---|
| Prev | Fast Backward | Chapter 47. System Catalogs | Fast Forward | Next |
Note: The following description applies both to Postgres-XC and PostgreSQL if not described explicitly. You can read PostgreSQL as Postgres-XC except for version number, which is specific to each product.
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 47-20. 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 |