> For the complete documentation index, see [llms.txt](https://docs.postgresql.tw/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.postgresql.tw/internals/views/view-pg-user-mappings.md).

# 53.36. pg\_user\_mappings \#

The view `pg_user_mappings` provides access to information about user mappings. This is essentially a publicly readable view of [`pg_user_mapping`](/internals/catalogs/catalog-pg-user-mapping.md) that leaves out the options field if the user has no rights to use it.

**Table 53.36. `pg_user_mappings` Columns**

| <p>Column Type</p><p>Description</p>                                                                                                                                                                                        |
| --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| <p><code>umid</code> <code>oid</code> (references <a href="/pages/1Xx9WBGilPUhSy9JDPil"><code>pg\_user\_mapping</code></a>.<code>oid</code>)</p><p>OID of the user mapping</p>                                              |
| <p><code>srvid</code> <code>oid</code> (references <a href="/pages/W21N7u6kIuMD53Tleqty"><code>pg\_foreign\_server</code></a>.<code>oid</code>)</p><p>The OID of the foreign server that contains this mapping</p>          |
| <p><code>srvname</code> <code>name</code> (references <a href="/pages/W21N7u6kIuMD53Tleqty"><code>pg\_foreign\_server</code></a>.<code>srvname</code>)</p><p>Name of the foreign server</p>                                 |
| <p><code>umuser</code> <code>oid</code> (references <a href="/pages/nyEMOe5gQKgypFQTDbjS"><code>pg\_authid</code></a>.<code>oid</code>)</p><p>OID of the local role being mapped, or zero if the user mapping is public</p> |
| <p><code>usename</code> <code>name</code></p><p>Name of the local user to be mapped</p>                                                                                                                                     |
| <p><code>umoptions</code> <code>text\[]</code></p><p>User mapping specific options, as “keyword=value” strings</p>                                                                                                          |

<br>

To protect password information stored as a user mapping option, the `umoptions` column will read as null unless one of the following applies:

* current user is the user being mapped, and owns the server or holds `USAGE` privilege on it
* current user is the server owner and mapping is for `PUBLIC`
* current user is a superuser

***

原文：[PostgreSQL 18.6 Documentation](https://www.postgresql.org/docs/18/view-pg-user-mappings.html)（英文原文，待翻譯）


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