MUTATING TABLES(ORA-04091) ERROR

Question

HI ALL,
i am trying to solve the above problem. I don't have much experience in pl/sql. I tell u the problem.
I am trying to write trigger on transaction_master table before insert or update so that record can insert into tran_modify_log table. Because of the referential integrity i got the error ORA-04091. I COPIED THE FOLLOWING CODE. BUT ITS FOR ONLY ONE COLUMN.OTHER COLUMNS ARE HARD CODED. U can see this in 2nd trigger IN_TRANS_MOD_LOG. can any body help me to insert all the column values from transaction_master table to tran_modify_log table. If is there any easy way please let me know.
with regards,
vali
CREATE OR REPLACE PACKAGE INSERT_TRANSACTION_MODIFY_LOG IS
-- DEFINE A PL/SQL TABLE TYPE TO STORE THE ORDER_ID INFO
TYPE INSERT_TRAN_MOD_LOG_TABLE IS TABLE OF TRANSACTION_MASTER.TRANSACTION_ID%TYPE
INDEX BY BINARY_INTEGER;
-- DECLARE VARIABLES FOR THE PL/SQL TABLE AND COUNTER
INSERT_TRAN_MOD_LOG_TABLE_REC INSERT_TRAN_MOD_LOG_TABLE;
INS_T_M_L_TAB_INDEX_NUM PLS_INTEGER:=0;
END INSERT_TRANSACTION_MODIFY_LOG;
CREATE OR REPLACE TRIGGER INS_TRANS_MOD_LOG BEFORE INSERT OR UPDATE ON TRANSACTION_MASTER FOR EACH ROW
BEGIN
--INCREMENT PL/SQL TABLE INDEX BEFORE INSERTING
INSERT_TRANSACTION_MODIFY_LOG.INS_T_M_L_TAB_INDEX_NUM:=INSERT_TRANSACTION_MODIFY_LOG.INS_T_M_L_TAB_INDEX_NUM+1;
--ADD THE TRANSACTION_ID TO THE PL/SQL TABLE
INSERT_TRANSACTION_MODIFY_LOG.INSERT_TRAN_MOD_LOG_TABLE_REC(INSERT_TRANSACTION_MODIFY_LOG.INS_T_M_L_TAB_INDEX_NUM):
=NVL(:OLD.TRANSACTION_ID,:NEW.TRANSACTION_ID);
END INS_TRANS_MOD_LOG;
CREATE OR REPLACE TRIGGER IN_TRANS_MOD_LOG BEFORE INSERT OR UPDATE ON TRANSACTION_MASTER
BEGIN
-- LOOP THROUGH THE PL/SQL, PERFORMING PROCESSING FOR EACH TRANSACTION
FOR LV_TAB_INDEX_NUM IN 1..INSERT_TRANSACTION_MODIFY_LOG.INS_T_M_L_TAB_INDEX_NUM LOOP
-- INSERT INITIAL TRANSACTION RECORD FOR EVERY TRANSACTION
INSERT INTO TRAN_MODIFY_LOG(MODIFY_DATE,MODIFY_TIME,TRANSACTION_ID,USER_ID)
VALUES('13/06/2002','13:30',INSERT_TRANSACTION_MODIFY_LOG.INSERT_TRAN_MOD_LOG_TABLE_REC(LV_TAB_INDEX_NUM),'MIKE');
END LOOP;
-- INITIALIZE PACKAGE VARIABLE COUNTER FOR SUBSEQUENT INSERTS
INSERT_TRANSACTION_MODIFY_LOG.INS_T_M_L_TAB_INDEX_NUM:=0;
END IN_TRANS_MOD_LOG;
/

Answer 1

sorry, my mistake, point 7-8 became:
7) But if u now login with the sys dba account:
connect sys/dbapass@database
then drop student.trg_a and student.trg_b and then recreate both under the sys schema:
CREATE OR REPLACE TRIGGER SYS.TRG_A
AFTER INSERT OR DELETE ON STUDENT.P
FOR EACH ROW
begin
if deleting then
update STUDENT.Q set cnt=cnt-1 where id=2;
else
update STUDENT.Q set cnt=cnt+1 where id=2;
end if;
end;
/--- cut point for trigger creation
CREATE OR REPLACE TRIGGER SYS.TRG_B
AFTER INSERT OR UPDATE ON STUDENT.Q
FOR EACH ROW
declare
p number;
maxr number;
begin
select sum(CNT) into p from STUDENT.Q where id=:new.id;
select sum(MAX) into maxr from STUDENT.R where id=:new.id;
dbms_output.put_line('P:'||p||', maxr:'||maxr);
if (p<=maxr) then
dbms_output.put_line('p<=maxr is true');
else
dbms_output.put_line('p<=maxr is false');
end if;
end;
8) reconnect with ur working user account:
example: connect student/password@database
9) when re-doing inserts as point 6), the trigger sys.trg_b will fire without raising any ora-04091 error!!!!
The trigger behave like if the mutating table limitation is not existing at all!!!
does anyone know anything about this behavior?
thank u very much
sincerely