UPDATE DEMO.REPOSITORY A SET A.VALUE = REPLACE(:B4 ,'"','"') 
WHERE
 A.DB_ID = :B3 AND A.Rep_ID=:B2 AND A.F_ID=:B1 


call     count       cpu    elapsed       disk      query    current        rows
------- ------  -------- ---------- ---------- ---------- ----------  ----------
Parse        1      0.00       0.00          0          0          0           0
Execute    135      0.12    4438.73          0       1348        297         135
Fetch        0      0.00       0.00          0          0          0           0
------- ------  -------- ---------- ---------- ---------- ----------  ----------
total      136      0.12    4438.74          0       1348        297         135

Misses in library cache during parse: 1
Misses in library cache during execute: 1
Optimizer mode: ALL_ROWS
Parsing user id: 1446     (recursive depth: 1)

CREATE OR REPLACE TRIGGER upd_Repo
BEFORE UPDATE
ON REPOSITORY 
REFERENCING NEW AS NEW OLD AS OLD
FOR EACH ROW
BEGIN
  IF USER<>'REPO' THEN
    :NEW.syschangedby:=USER;
    :NEW.syschanged:=SYSDATE;
  END IF;
END;

ALTER SESSION SET EVENTS '10046 trace name context forever, level 8';