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This events will alternates between BEFORE and AFTER row level triggers.4) Finally the AFTER statement level trigger fires.For Example: Let's create a table 'product_check' which we can use to store messages when triggers are fired.Let's create a BEFORE and AFTER statement and row level triggers for the product table.SQL CREATE or REPLACE TRIGGER 2 After_Update_Row_product 3 AFTER 4 UPDATE On Product 5 FOR EACH ROW 6 BEGIN 7 INSERT INTO product_check 8 Values ('After update, Row level', Sysdate); 9 END; 10 / Trigger created.SELECT * From PRODUCT; PRODUCT_ID PRODUCT_NAME SUPPLIER_NAME UNIT_PRICE ---------- -------------------------------- -------------------------------- ---------- 1001 Samsung Flipkart 34000 1002 LG Flipkart 12000 1003 Apple Amazon 54000 1004 i Phone7 Amazon 54000 SQL SELECT * FROM PRODUCT_CHECK; MESSAGE CURRENT_D -------------------------------------------------- --------- Before update, statement level 02-NOV-16 Before update row level 02-NOV-16 After update, Row level 02-NOV-16 Before update row level 02-NOV-16 After update, Row level 02-NOV-16 After update, statement level 02-NOV-16 12 rows selected.SQL CREATE or REPLACE TRIGGER Before_Upddate_Row_product 2 BEFORE 3 UPDATE ON Product 4 FOR EACH ROW 5 BEGIN 6 INSERT INTO Product_Check 7 Values ('Before update row level’, Sysdate); 8 END; 9 / Trigger created.

2) Statement level trigger - An event is triggered for each sql statement executed.

We can use the data dictionary view 'USER_TRIGGERS' to obtain information about any trigger.

The below statement shows the structure of the view 'USER_TRIGGERS' NAME Type -------------------------------------------------------- TRIGGER_NAME VARCHAR2(30) TRIGGER_TYPE VARCHAR2(16) TRIGGER_EVENT VARCHAR2(75) TABLE_OWNER VARCHAR2(30) BASE_OBJECT_TYPE VARCHAR2(16) TABLE_NAME VARCHAR2(30) COLUMN_NAME VARCHAR2(4000) REFERENCING_NAMES VARCHAR2(128) WHEN_CLAUSE VARCHAR2(4000) STATUS VARCHAR2(8) DESCRIPTION VARCHAR2(4000) ACTION_TYPE VARCHAR2(11) TRIGGER_BODY LONG This view stores information about header and body of the trigger.

When the table 'xyz' is updated, trigger B fires and will insert a row in table 'abc'.

This cyclic situation continues and will enter into a infinite loop, which will crash the database.

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DEPTNO; 11 EXCEPTION 12 WHEN NO_DATA_FOUND THEN 13 INSERT INTO DEPT_TEST VALUES (Dept_Sequence. Department) 14 RETURNING DEPTNO INTO V_ID; 15 END; 16 INSERT INTO EMP_TEST (ID, NAME, DEPTNO) VALUES (Emp_Sequence. NAME, V_ID); 17 END Updte Emp Dept; 18 / Trigger created.

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