ALTER LARGE OBJECT — change the definition of a large object
ALTER LARGE OBJECTlarge_object_oidOWNER TO {new_owner| CURRENT_ROLE | CURRENT_USER | SESSION_USER }
ALTER LARGE OBJECT changes the definition of a large object.
You must own the large object to use ALTER LARGE OBJECT. To alter the owner, you must also be able to SET ROLE to the new owning role. (However, a superuser can alter any large object anyway.) Currently, the only functionality is to assign a new owner, so both restrictions always apply.
large_object_oidOID of the large object to be altered
new_ownerThe new owner of the large object
There is no ALTER LARGE OBJECT statement in the SQL standard.
Read the upstream documentation. For corrections, first check the current version.