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| title: pg_shdescription |
| --- |
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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](pg_description.html#topic1), 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 HAWQ system: there is only one copy of `pg_shdescription` per system, not one per database. |
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| <a id="topic1__hp143898"></a> |
| <span class="tablecap">Table 1. pg\_catalog.pg\_shdescription</span> |
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| | column | 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 | |
| | `description` | text | | Arbitrary text that serves as the description of this object. | |
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