Materialized view with refresh types in Oracle

Materialized view with refresh types  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.


The following refresh types are available.



--===========MATERIALIZED VIEW === with refresh types  Options ============

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.

----- Refresh Type :- FAST ----

CREATE MATERIALIZED VIEW XXSD_EMP_M_V1
BUILD  IMMEDIATE 
REFRESH FAST
ON DEMAND
AS
SELECT * FROM xxsd_emp_tl where deptno = 10

SELECT * FROM xxsd_emp_tl

desc xxsd_emp_tl

select * from ALL_CONSTRAINTS
where TABLE_NAME = 'XXSD_EMP_TL'

alter table xxsd_emp_tl add constraints XX_EMPNO_PK Primary key (EMPNO)

create materialized view log on XXSD_emp_TL

select * from XXSD_EMP_M_V1


----- Refresh Type :- COMPLETE ----

CREATE MATERIALIZED VIEW XXSD_EMP_M_V2
BUILD  IMMEDIATE 
REFRESH COMPLETE
ON DEMAND
AS
SELECT * FROM xxsd_emp_tl where deptno = 10

select * from XXSD_EMP_M_V2


----- Refresh Type :- FORCE ----

CREATE MATERIALIZED VIEW XXSD_EMP_M_V3
BUILD  IMMEDIATE 
REFRESH FORCE
ON DEMAND
AS
SELECT * FROM xxsd_emp_tl where deptno = 10

DROP MATERIALIZED VIEW XXSD_EMP_M_V3

select * from XXSD_EMP_M_V3


select object_name, object_type from all_objects
where object_name = 'XXSD_EMP_M_V3'


select * from ALL_MVIEWS
where MVIEW_NAME LIKE 'XXSD_EMP_M_V3%'


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