How to find Materialized views in OBIEE

Hi gurus,
how to find materialized views which are used in OBIEE?
Do We see them in view log session after running a report?
I have a requirement to find MV'S.Do we use MV'S in OBIEE?What is the use of MV?
Kindly answer me.
Thanks,
siva

Refer
http://gerardnico.com/wiki/database/oracle/materialized_view

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ALL_REFRESH and ALL_REFRESH_CHILDREN
http://download.oracle.com/docs/cd/B19306_01/server.102/b14227/rarsnapviews.htm#REPMA027
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hi,
im having a problem in refreshing materialized view through a trigger.
CREATE OR REPLACE TRIGGER L_TRG_MARC_TEST
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DBMS_MVIEW.REFRESH implicitly commits. COMMIT is not permitted in triggers, as you can see, unless you use AUTONOMOUS_TRANSACTION.
Try
CREATE OR REPLACE TRIGGER L_TRG_MARC_TEST
BEFORE DELETE OR INSERT OR UPDATE ON MARC_BOOK_B_ENG
DECLARE
PRAGMA AUTONOMOUS_TRANSACTION;
BEGIN
DBMS_MVIEW.REFRESH('TITLE_ENG_MV','C','',TRUE,FALSE,0,0,0,TRUE);
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How to find material and vendor combination which has freight conditions?

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Materialized Views in OBIEE

Hi,
I have a quick question. How can I include a materialized view (which I created in the OWB) in OBIEE (11.1.1.5)?
Obviously I have to import the view with the administration tool but do I have to join the view with the fact table?
Is there a "how to" or a tutorial to this matter? I searched but didn't find anything which helped me.
thx

Why use an opaque view ? Its not like there is anything complex about including an aggregate table.
Makes debugging a nightmare and lineage is ruined once you go that route.
And why are you joining a Materialised view to your fact table ? I would have thought you would join them to the dimension tables.
Import it as a table, join up the FK's and model it as you would an aggregate table. Unless im missing something?

How to get Materialized View to ignore unused columns in source table

When updating a column in a source table, records are generated in the corresponding materialized view log table. This happens even if the column being updated is not used in any MV that references the source table. That could be OK, so long as those updates are ignored. However they are not ignored, so when the MV is fast refreshed, I find it can take over a minute, even though no changes are required or made. Is there some way of configuring the materialized view log such that the materialized view refresh ignores these updates ?
So for examle if I have table TEST:
CREATE table test (
d_id NUMBER(10) PRIMARY KEY,
d_name VARCHAR2(100),
d_desc VARCHAR2(256)
This has an MV log MLOG$_TEST:
CREATE MATERIALIZED VIEW LOG ON TEST with rowid, sequence, primary key;
CREATE MATERIALIZED VIEW test_mv
refresh fast on demand
as
select d_id, d_name
from test;
INSERT 200,000 records
exec dbms_mview.refresh('TEST_MV','f');
update test set d_desc = upper(d_desc) ;
exec dbms_mview.refresh('TEST_MV','f'); -- This takes 37 seconds, yet no changes are required.
Oracle 10g/11g

I would love to hear a positive answer to this question - I have the exact same issue :-)
In the "old" days (version 8 I think it was) populating the materialized view logs was done by Oracle auto-creating triggers on the base table. A "trick" could then make that trigger become "FOR UPDATE OF <used_column_list>". Now-a-days it has been internalized so such "triggers" are not visible and modifiable by us mere mortals.
I have not found a way to explicitly tell Oracle "only populate MV log for updates of these columns." I think the underlying reason is that the MV log potentially could be used for several different materialized views at possibly several different target databases. So to be safe that the MV log can be used for any MV created in the future - Oracle always populates MV log at any update (I think.)
One way around the problem is to migrate to STREAMS replication rather than materialized views - but it seems to me like swatting a fly with a bowling ball...
One thing to be aware of: Once the MV log has been "bloated" with a lot of unneccessary logging, you may perhaps see that all your FAST REFRESHes afterwards becomes slow - even after the one that checked all the 200000 unneccessary updates. We have seen that it can happen that Oracle decides on full table scanning the MV log when it does a fast refresh - which usually makes sense. But after a "bloat" has happened, the high water mark of the MV log is now unnaturally high, which can make the full table scan slow by scanning a lot of empty blocks.
We have a nightly job that checks each MV log if it is empty. If it is empty, it locks the MV log and locks the base table, checks for emptiness again, and truncates the MV log if it is still empty, before finally unlocking the tables. That way if an update during the day has happened to bloat the MV log, all the empty space in the MV log will be reclaimed at night.
But I hope someone can answer both you and me with a better solution ;-)

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set serveroutput on
DECLARE
v_cur_tid NUMBER(5):=0;
v_cur_cs_attendance NUMBER(5):=0;
v_cur_c_tot_enrolments NUMBER(5):=0;
v_most_enrolments NUMBER(5):=0;
v_least_enrolments NUMBER(5):=0;
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v_least_pop_cid NUMBER(5):=0;
CURSOR class_cursor IS
select
id,
name,
max_attendees
from
class
where
id in (select distinct(event_id) from trainer_schedule where event_type='c' and is_active='y')
order by id;
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DBMS_OUTPUT.PUT_LINE('==================================================================================================================================');
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--print the header or subsection
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/

Hi,
you could use Dynamic SQL /Execute immediate to run DDL from a stored procedure.
http://download-uk.oracle.com/docs/cd/B10501_01/appdev.920/a96624/11_dynam.htm
Could you please tell why do you want to create a materialized view in stored procedure ?
How frequently you will runt this procedure . It would is better to create a MV once and use it.
thanks

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when the material is transferred from the one plant to another.
before going to transfer the material.
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I this case we may have multiple invoices may have the multiple material documents in receiving plant .
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How do you create materialized view logs on a remote database.
I tried
create materialized view log on global_express_views.vccs438_project_work_request@h92edwp with sequence, rowid ( columns...)
ERROR at line 1:
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I am not getting the error exactly. But have some suggestion:
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We have Oracle 11.2.0.1 on Redhat 5.2. We use a dozen of fast refresh materialized views in our application.
From time to time MV refresh takes longer time than the refresh interval.
One of way to improve performance of MV refresh is to make the refresh parallel, e.g. http://www.dba-oracle.com/t_materialized_views_refreshing_performance.htm
- Use parallel DML - Oracle author Michael Armstrong Smith notes "I've done parallel materialized view refreshing
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We use {code}
alter materialied view MV_OFFENSE parallel REFRESH FAST start with sysdate next sysdate+ 1/24;
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Doc http://download.oracle.com/docs/cd/E11882_01/server.112/e16579/refresh.htm#i1006319 says:
>
In a data warehousing environment, assuming that the materialized view has a parallel clause, the following sequence of steps is recommended:
1.
Bulk load into the fact table
2.
Enable parallel DML
3.
An ALTER SESSION ENABLE PARALLEL DML statement
4.
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How to Refresh Materialized views

Hi All,
How ro refresh Mv views manualy.could you pls provide definiation for refreshing the MV's manually.
Thanks for your help.

When creating the materialized view, you have the option of specifying whether the refresh occurs manually (ON DEMAND) or automatically (ON COMMIT, DBMS_JOB).
You can use something like:
EXECUTE DBMS_MVIEW.REFRESH('emp_dept_sum','F'); -- 'F' for fast refresh, 'C' for complete refresh
For automatic fast refresh:
CREATE MATERIALIZED VIEW emp_mv
ON PREBUILT TABLE
REFRESH FAST ON COMMIT
ENABLE QUERY REWRITE
AS SELECT empno, ename, dname, loc,
         e.rowid emp_rowid,
         d.rowid dep_rowid
    FROM emp e, dept d
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How to change Materialized View query?

Hi all,
sorry for this newbie question, but I'm not able to work out this matter...
How can I change the query used by a materialized view without dropping an recreate all, and using another user(SYS in my case)?
It looks like the command 'alter materialized view ...' does not allow this, am I wrong?
thanks a lot
aldo

You quick answer saved me a lot of other unsuccessfully searches.
thanks
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How to prevent materialized views from refreshing if source table is zero

any ideas?

Probably not what you were hoping for but here are a couple of ideas.
Your account shows - 113 (85 unresolved)
1. How about helping to keep the forum clean by reviewing your 85 unresolved previous questions and giving HELPFUL or ANSWERED credit to those that helped you in the past.
2. Read the FAQ at the top right of the page and post the information about your system and software so that we know what you are working with.
3. Ask your question in the body of the thread. Don't just say 'Any ideas'.
What exactly is your question? Is this an academic question or do you have an actual problem that needs to be addressed?
If you have an actual problem produce the DDL for the materialized view and information about the type of refresh that has been set up for it. Is there a materialized view log on the base table(s)?
The simple answer to your quest is to use REFRESH ON DEMAND and check the base table(s) before you do a manual
refresh. The best answer depends on what version of Oracle you are using and what your actual setup is. Are your
MVs in REFRESH GROUPS?. That can make a difference in the answer.
How can anyone help with this question if you won't provide the information needed(FAQ)? Why SHOULD anyone help if you show you don't appreciate the help by marking questions answered once you have been helped.

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I want to add a column to a table, but I want to make sure
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Tim

To find out, where the table is used you can select:
select owner,name,type
from all_dependencies
where referenced_owner = (select user from dual)
and referenced_name = 'TABLENAME'
and referenced_type = 'TABLE'
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To find out, what objects are invalid:
select owner, object_name, object_type
from all_objects
where status = 'INVALID';
regards
Anna

How to find Materialized views in OBIEE

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