Trouver un objet particulier en Postgres

select oid,relfilenode,relname from pg_class where relfilenode='16826';




  oid  | relfilenode |        relname        
-------+-------------+-----------------------
 16804 |       16826 | table_toto




ou

dev=# select oid,relfilenode,relname from pg_class where relname='table_toto';