Refresh/Update data in a materialized view

Hi,
I have question about the data in a materialized view and how it is refreshed. My mat view has all my dimension-ids and my (for my specialize needs) aggregated measures from my fact table. I used the mat view wizard to create my view - which works perfectly. But now I wonder if I have to create some sort of mapping(?) or some sort of trigger to refresh the data in the mat view. Or is the data automatically refreshed when I start my fact table mappings. I use OWB 11gR2
thx

MVs have properties for refresh - you an refresh based on schedules or when dependent data is committed or manually.
Cheers
David

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Refresh groups to administer several materialized views?

Hi,
I had three materialized views in my database. They are used for decision support and access local data. Each one is completely refreshed at a distinct time during the night.
Now, application developers asked for more 3 materialized views. Although there is no need to guarantee referential integrity between the materialized views, it seems to me that the more efficient way to administer their refresh is by using a refresh group. Therefore, I am planning to create a refresh group with the 6 materialized views.
Is there another good way to administer refresh options of several materialized views?
Regards.

If the existing three materialized views are refreshed at distinct times during the night, I'm not sure what benefit there would be to putting the three into a single refresh group (and I'm ignoring what happens when you add the three new ones). You put multiple materialized views into a refresh group so that you can do a single refresh and so that the data is internally consistent. If you don't need the data to be consistent and you want the materialized views to be refreshed at different points in time, I'm not sure what benefit you'd derive from putting them in a refresh group.
Justin

Exporting data from a materialized view in Oracle 10g

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Here is what I'm trying to do.
I created materialized views using multiple base tables in my local server and the base tables got populated using a long process.
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I made a trigger (for each row) on a materialized view(replication data from a master table in in a different database), which is refreshed by a refresh group (exec dbms_refresh.refresh('"...). However, the update order/sequence is important and must be handled (by the trigger) in the same order how the updates where done in the master table. Unfortunately the updates in the materialized view are NOT in the same order. The trigger is fired in a wrong order.
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http://docs.oracle.com/cd/B19306_01/server.102/b14200/pseudocolumns009.htm

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I have a materialized view set to auto refresh(e.g hourly), I need to query this date and display in the report. I create a procedure which return the NEXT_DATE from the ALL_REFRESH_CHILDREN table, the procedure and the view all in schema HK3XDDB.
If I login as sys, dba in the sql plus and query the procedure, it return the next date, but if I login as normal user which has permission to execute all procedures, it didn't return anything, so I change ALL_REFRESH_CHILDREN to USER_REFRESH_CHILDREN, still no luck. But the details from the USER_MVIEWS can be returned, just won't return anything in the REFRESH one. How to query the next date out?
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Thank you for the reply. It's same with USER_REFRESH_CHILDREN, I can get the result when I run the procedure in SQL PLUS login as sys dba, but if I run the procedure using normal user which has permission to run any procedure, then nothing return. It might be a permission problem but I just can't figure out why.
Let me explain in detailed:
Schema HKXDDB, this schema has procedure TestProcedure, in the procedure, I have two ref cursor return, one is for select * from USER_JOBs (or from USER_REFRESH_CHILDREN, I have tried both), one is for select * From USER_MVIEWS, this schema has the materialized view. User HKDWUser has permission to run any procedures, so when this user run the TestProcedure which is own by HKXDDB, the cursor that select from USER_MVIEWS can return results which are materialized views owned by HKXDDB, but the cursor that select form USER_JOBS or USER_REFRESH_CHILDREN always return no rows.
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Hi,
In order to update base table with MVs data, I am trying real time data transfer between two databases. One is Oracle 8i and other is Oracle 9i. I have created an updatable MV in 9i on a base table using database link. The base table is in 8i. Materialized View log is created in 8i on base table. MV has to be associated to some replication group, but I am not able to create replication group in 9i to which MV has to be associated. The required packages are not installed.
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/*Create Materialized View replication group*/
BEGIN
DBMS_REPCAT.CREATE_MVIEW_REPGROUP (
gname => 'TEST_MV_GRP',
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Yes, I created link between two databases and was able to update tables on 8i from 9i database using that link.
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ORA-06550
PLS-00201 : identifier 'SYS.DBMS_REPCAT_UTL2@'TEST_DATA_LINK' must be declared
ORA-06550
PLS-00201 : identifier 'SYS.DBMS_REPCAT_UNTRUSTED@'TEST_DATA_LINK' must be declared
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ORA-06512 : at "SYS.DBMS_REPCAT_SNA", line 64
ORA-06512 : at "SYS.DBMS_REPCAT", line 1262
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Thanks,
Shailesh

The data of my materialized view....in the while

Hello
We have problems with materialized views
We have one wich re-build each a short period of time
¿Can i avoid the data to dissapear in the time process of refresh?
Is so annoing to our clients to see that "from time to time" the data just dissapear for one period of time -the time while the materialized view is refreshing-
Thank you in advance
Bruno. Madrid. Spain

> Is so annoing to our clients to see that "from time to time" the data just dissapear for
one period of time -the time while the materialized view is refreshing-
Have a similar problem. And dealing with large data volumes that makes the DELETE of the MV a very undesirable feature. Not as much a the resource footprint required, but the time it takes to do this - and the very tight processing windows that exist.
The solution is a self-rolled and very likely not ideal for most - but it works well enough for us in production.
No MV. Create a partition table. Create a staging table. Do a manual "full refresh" of the staging table (TRUNCATE and direct path INSERT). Follow this by a partition exchange with the partition table (no validation and including indexes). The result is that the data is replaced in the partitioned table within a second - no long running and expensive DELETE. End-users not effected by having a truncate pulling the data from beneath their reports.

How do I figure where is the data in a materialized view coming from

Hi: when I run select NAME, OWNER from dba_mview_refresh_times, I see a number of materialized views. How do I find more details about this view i.e where is the data coming from and which fields. The source table that is in another database changed. But the view on my database where the materialized view exist has not changed. I want to confirm from where is data coming in this view
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SQL> select * from dict where table_name like 'ALL%MVIEW%'
TABLE_NAME                     COMMENTS
ALL_BASE_TABLE_MVIEWS          All materialized views with log(s) in the database that the user can s
                               ee
ALL_MVIEWS                     All materialized views in the database
ALL_MVIEW_AGGREGATES           Description of the materialized view aggregates accessible to the user
ALL_MVIEW_ANALYSIS             Description of the materialized views accessible to the user
ALL_MVIEW_COMMENTS             Comments on materialized views accessible to the user
ALL_MVIEW_DETAIL_PARTITION     Freshness information of all PCT materialized views in the database
ALL_MVIEW_DETAIL_RELATIONS     Description of the materialized view detail tables accessible to the u
                               ser
ALL_MVIEW_DETAIL_SUBPARTITION Freshness information of all PCT materialized views in the database
ALL_MVIEW_JOINS                Description of a join between two columns in the
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ALL_MVIEW_KEYS                 Description of the columns that appear in the GROUP BY
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ALL_MVIEW_LOGS                 All materialized view logs in the database that the user can see
ALL_MVIEW_REFRESH_TIMES        Materialized views and their last refresh times for each master table
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ALL_REGISTERED_MVIEWS          Remote materialized views of local tables that the user can see
13 rows selected.

Dimension updates in Analytic workspace:Materialized views?

We are using the 10g version of Oracle OLAP. We have 1 materialized view joining with our custom table and forming 1 source view per dimension. We load the cube programatically by refresh the dimension materialized views, followed by loading fact data to views against cube and then the actual workspace and cube creation..
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Hi everybody
I would like to know how can I do to refresh all data from a View with a view container the problem is:
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Is it possible to refresh the table from a Materialized view

Hi,
Is it possible to update the underlying table on which a Materialized view is created when some changes in a Materialized view is done.Is this reverse compatibility possible in Materialized View?
Thanks in Advance,
V.Dennis

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Hi,
i have a little doubt in Materialized view. i created a materialized view and log with the following query,
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*Cause:+
*Action:+
i guess i am doing wrong. kindly help me here. i want to update it without drop and recreate.
thanks,
Jeevanand.Ke

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You can add new columns to a materialized view log.
ALTER MATERIALIZED VIEW LOG ON sggi_mrps.emp ADD(deptno);Thanks,
Shankar
Edited by: Shankar Viji on Aug 24, 2012 2:11 AM

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