Make Table read only

SQL> CREATE TABLE tbl_read_only (id NUMBER);
Table created.

SQL> INSERT INTO tbl_read_only VALUES(1);
1 row created.

SQL> COMMIT;
Commit complete.

SQL> SELECT * FROM tbl_read_only;
        ID


———-


         1

SQL> CREATE TRIGGER trg_tbl_read_only BEFORE DELETE OR INSERT OR UPDATE


  2  ON tbl_read_only


  3  BEGIN


  4  RAISE_APPLICATION_ERROR(-20202,’Table Status: READ ONLY!!!’);


  5  END;


  6  /
Trigger created.
SQL> INSERT INTO tbl_read_only VALUES(2);
INSERT INTO tbl_read_only VALUES(2)
            *
ERROR at line 1:

ORA-20202: Table Status: READ ONLY!!!