Materialized view with refresh triggered Mode in Oracle

Materialized view with refresh triggered Mode  in Oracle :- 




The BUILD clause options are shown below.
         
IMMEDIATE
The materialized view is populated immediately.
DEFERRED
The materialized view is populated on the first requested refresh.


The following refresh types are available.

FAST
A fast refresh is attempted. If materialized view logs are not present against the source tables in advance, the creation fails.
COMPLETE
The table segment supporting the materialized view is truncated and repopulated completely using the associated query.
FORCE
A fast refresh is attempted. If one is not possible a complete refresh is performed.

A refresh can be triggered in one of two ways.

ON COMMIT
The refresh is triggered by a committed data change in one of the dependent tables.
ON DEMAND
The refresh is initiated by a manual request or a scheduled task.


A refresh can be triggered in one of two ways.



--========MATERIALIZED VIEW === with refresh Trigger Options ========

A refresh can be triggered in one of two ways.

        ON COMMIT : The refresh is triggered by a committed data change in one of the dependent tables.
        ON DEMAND : The refresh is initiated by a manual request or a scheduled task.


CREATE MATERIALIZED VIEW XXSD_EMP_M_V
BUILD  IMMEDIATE 
REFRESH FORCE
ON DEMAND
AS
SELECT * FROM xxsd_emp_tl where deptno = 10

DROP MATERIALIZED VIEW XXSD_EMP_M_V

select * from XXSD_EMP_M_V


update xxsd_emp_tl
set COMM = NVL(COMM,0)+1000
where deptno = 10

select * from xxsd_emp_tl
where deptno = 10

commit;

select * from XXSD_EMP_M_V

EXEC DBMS_MVIEW.refresh('XXSD_EMP_M_V');


--====================== ON COMMIT --====================
@@@ Example 1 with single table -----
--====================== ON COMMIT --====================

create table XXSD_EMP (
emp_no number,
emp_name varchar(100),
dept_no number,
CONSTRAINT emp_pk Primary Key (emp_no)
)

select * from XXSD_EMP

insert into XXSD_emp values (1,'Manoj',10);

insert into XXSD_emp values (2,'Sanjay',20);

COMMIT;

select * from XXSD_EMP

--====================================================
I created materialized view logs on these tables with rowid and materialized views as follows:
--====================================================


create materialized view XXSD_empdept_mv
BUILD  IMMEDIATE 
REFRESH FORCE
ON COMMIT
as
select * from  XXSD_emp


create materialized view log on XXSD_emp


select * from XXSD_emp

select * from XXSD_empdept_mv

--====================================================

insert into XXSD_emp values (3,'JP',30);

commit;

select * from XXSD_empdept_mv;

--=============


insert into XXSD_emp values (4,'Ravi',40);

commit;


--====================================================

DROP TABLE XXSD_EMP

DROP materialized view XXSD_empdept_mv


--========================
@@@@ Example 2 with Double table


DROP TABLE XXSD_DEPT

DROP TABLE XXSD_EMP

DROP materialized view XXSD_empdept_mv

--====================================================

create table XXSD_DEPT (
dept_no number ,
dept_name varchar(32) ,
dept_desc varchar(32),
CONSTRAINT dept_pk Primary Key (dept_no)
)

select * from XXSD_DEPT

create table XXSD_EMP (
emp_no number,
emp_name varchar(100),
dept_no number,
CONSTRAINT emp_pk Primary Key (emp_no,dept_no)
)

select * from XXSD_EMP

insert into XXSD_dept values (10,'it','desc1');

insert into XXSD_dept values (20,'hr','desc2');

COMMIT;

insert into XXSD_emp values (1,'Manoj',10);

insert into XXSD_emp values (2,'Sanjay',20);

COMMIT;

select * from XXSD_EMP

select * from XXSD_DEPT

--====================================================
I created materialized view logs on these tables with rowid and materialized views as follows:
--====================================================

create materialized view log on XXSD_emp with rowid

create materialized view log on XXSD_dept with rowid

create materialized view XXSD_empdept_mv
refresh fast
on commit
as
select a.rowid dept_rowid, b.rowid emp_rowid, a.dept_no,b.emp_no,b.emp_name
from XXSD_dept a, XXSD_emp b
where a.dept_no=b.dept_no

select * from XXSD_empdept_mv

--====================================================

insert into XXSD_dept values (30,'it','desc3');

commit;

insert into XXSD_emp values (3,'JP',30);

commit;

select * from XXSD_empdept_mv;

--=============

insert into XXSD_dept values (40,'it','desc3');

commit;

insert into XXSD_emp values (4,'Ravi',40);

commit;

--==========================================================

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