Comments on: Oracle Materialized Views – Fast Refresh

By: azimfahmi

azimfahmi — Tue, 11 May 2004 10:09:35 +0000

Try creating an updateable materialized view in the same schema.. Use insert, update, delete trigger on the base table to appropriately update the materialized view; in that case you do not want the log on the materialized view.

If this seems an unacceptable solution, you may want to provide a fast refresh time (NEXT) on your CREATE MATERIALIZED VIEW script.. But then you have to be content with the fact that the materialized view data is not real time data and that it lags behind the base table by your specified refresh rate.

Let me know what you think.

Thanks

Azim

By: frankkulash

frankkulash — Tue, 04 May 2004 14:42:56 +0000

Thanks! That works in Oracle 9.2, but in 8.1.7 I get “ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view”

Here’s my code:

– ****************************************

ALTER SESSION SET query_rewrite_enabled = TRUE;
ALTER SESSION SET query_rewrite_integrity = ENFORCED;

DROP MATERIALIZED VIEW emp_view;

SELECT *
FROM user_sys_privs;

CREATE MATERIALIZED VIEW LOG ON emp;

CREATE MATERIALIZED VIEW emp_view
BUILD IMMEDIATE
REFRESH ON COMMIT
ENABLE QUERY REWRITE
AS
SELECT empno
, ename
, deptno
, mgr
FROM emp
WHERE deptno 10
;