ALTER LARGE OBJECT 7 SQL - Language Statements ALTER LARGE OBJECT change the definition of a large object ALTER LARGE OBJECT ALTER LARGE OBJECT large_object_oid OWNER TO new_owner ALTER LARGE OBJECT changes the definition of a large object. The only functionality is to assign a new owner. You must be superuser or owner of the large object to use ALTER LARGE OBJECT. large_object_oid OID of the large object to be altered new_owner The new owner of the large object There is no ALTER LARGE OBJECT statement in the SQL standard.