# pg_extprotocol

System table `pg_extprotocol` stores information about external protocol in OushuDB.



Table 1.`pg_catalog.pg_extprotocol`

| Column         | Type      | references                                                   | description |
| :------------- | :-------- | :----------------------------------------------------------- | :---------- |
| ptcname        | name      |                                                              |             |
| ptcreadfn      | oid       | [**pg_proc**.oid](http://stephendotcarter.github.io/greenplum-syscat-ref/#pg_proc_oid) |             |
| ptcwritefn     | oid       | [**pg_proc**.oid](http://stephendotcarter.github.io/greenplum-syscat-ref/#pg_proc_oid) |             |
| ptcvalidatorfn | oid       | [**pg_proc**.oid](http://stephendotcarter.github.io/greenplum-syscat-ref/#pg_proc_oid) |             |
| ptcowner       | oid       |                                                              |             |
| ptctrusted     | bool      |                                                              |             |
| ptcacl         | aclitem[] |                                                              |             |