Storing missing data in Materialized View
There is 1 View which contains all the web activities on each day and I am extracting summary data as follows.
1. Date
2. User Access counts on the date
But the base table of this view consists of 2 table, log1 and log2, and each
table is switched each 14 days. So, this view can reference the data until
maximum 28 days.
In this environment, I am planning to store the summary data which is made
before 28 days, using Materialized View. But can Materialized View store the
data which is gone in the base table or View? I want to refresh only recent data
and keep past data as it is in the Materialized View.
Thank you for the reply.
So, once the materialized view is refreshed, the previous data will be cleared, right? I wanted to store old data and add new data at the same time, but it seems to be impossible.
In our environment, table Log1 and Log2 are used alternately. So, once 14 days data are stored in Log1, new log data will be written into Log2 table and after another 14 days, the new log data will be written in Log1 Table. So, Maximum 28 days data can be stored.
Similar Messages
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Moving data from Materialized View to downstream application
Database Version: 9i Release 2
I've created a Materialized View on a base table, the purpose of which is to capture data changes to send to a downstream application
(I've been advizsed to avoid using Streams for now until we upgrade to 10g)
I need to either:
a) Make that data available for another process to pick up and have knowledge of what it needs to pick up versus what it has already picked up
or
b) Send/Update a table or MV at a downstream MS SQL Server database (resides within our firewall)
Some notes/questions
I cannot change the structure of the underlying base table
On the MV I could capture a date-time which records each time a record is touched on the base table, the problem is that many of these updates are “meaningless” and I should not send such updates downstream
1.Is there a way I can timestamp/flag the records as they get inserted/updated on the MV? (potentially used by the pickup process to identify what it needs to pick up)
2. If I flag the records e.g. “needs pickup” – would it be ok to make the MV updateable so the process can then mark the records as “picked up”. Performance?
3. Can I create a trigger on the MV to write records to a secondary table as they are inserted/updated on the MV?
4. Could I use the MV log tables MLOG$ to help me in any way?
I’m guessing there is no way to do the following but:
5. Is there a way to include a column on a Materialized View but ignore it in terms of capturing changes. e.g. I have columns a,b,c,d,e on my base table, I want to include a,b,c in my Materialized View but I only want my MV to be updated if a or b is updated on base table. If only column c is updated do not send any update to MV
Many thanks for any insightYes I do have a unique identifier on each record in the base table and therefore also in the MV.
So now the Downstream application has to update some of its own database tables based on what is in the MV that I provide - just so I understand how would that work e.g.:
1. MV gets refreshed from my base table every minute
2. Some records are newly inserted and some simply updated
and this is the part I don't understand (I might be missing something obvious)....
3. Downstream application interrogates the MV every (say 1-2 minutes) and updates its own tables based on the data there.....but let's say MV contains 10,000 records and in the last minute 100 of those records have been updated and another 100 inserted - how will it know the 200 records it needs to pull?
Thanks again -
Store Previous Data in Materialized Views
Hello All,
Thanks in Advance for sharing knowledge.We have a materialized view and using Oracle 10g.
Is there any way we can store previous data as well as have new data in the materialized view.
I mean it would have old as well as new data.
Regards
RahulThanks for your prompt reply.I am not looking for flashback query.
Actually i have to send the data to user and materialized view would only most recent data after refresh,but i would like to have the previous data before refresh and new data after refresh.
Regards
Rahul -
Materialized view fast refresh with date field
I have a situation where I need to create a materialized view worth of 6 months of data with fast refresh option from the master table. Somehow whenever I have the where clause added with the date field then it craps out with "ORA-12015: cannot create a fast refresh materialized view from a complex query".
Here is what I am trying to do. Please let me know if there is any other way to accomplish this.
create table test (id number, date_time DATE);
CREATE MATERIALIZED VIEW LOG ON test WITH ROWID;
CREATE MATERIALIZED VIEW cms.scoreboard_statistics_mv
BUILD IMMEDIATE
REFRESH FAST
WITH ROWID
AS
SELECT * from test
WHERE date_time >= sysdate - 180;
ORA-12015: cannot create a fast refresh materialized view from a complex query
Thanks,
RajIt's crazy but a new time Metalink help us into the Note:179466.1
The restrictions that prevent snapshots from being fast refreshed depend on
the version of Oracle being used, a full list of these by version is included
in section 3. In all cases the snapshot defining query should:
- refer to fully qualified table names rather than to partial table names.
- refer to remote tables only, not to remote master views or synonyms.
- not generate context sensitive data. For example, do not create a simple
snapshot with a query that uses the SQL functions :SYSDATE, UID or USER. -
Hi,
I generated materialized view and will maintain data on it when I run delete statement that show below error
ORA-01732: data manipulation operation not legal on this view
So my question is How to maintain data on M View (delete old data)? because I need to keep data only 2 months but source table keep data 6 months.
Regards,
Hikotaohiko wrote:
There have 8 tables but have only one table that have date/time column and others tables will use primary key from first table relate to data.
And source tables have total records around 300 million records but I want 2 months that around 90 million records.
So I plan to delete data every days that older than 2 months and delete others table with relation by primary from first table.
Can I do? and How to do that?
Regards,
HikoHi,
No you cannot delete the data from materialized view if the view is complex and does not statisfy some basic rules.
Even if you satisfy some of the basic rules still the thing/expectation you have with your MV is not provided by Oracle. If you delete any data from MV, it would be deleted from base table also.
Work around and a better implementation would be
Just include in your create mv a where clause stating
date/time column > trunc(sysdate)-60This would take care of all the other tables data also if they are joined with the main table.
Regards
Anurag -
Cannot create Materialized View using PL/SQL procedure
Hello,
I have a question related to Materialized View creation.
I have a stored procedure that creates materialized view. When trying to run this procedure I get insufficient privileges error: ORA-01031.
When I run content of this procedure as anonymous PL/SQL block them materialized view is created without any complications.
Can you please advice me on that topic?
Is it even possible to create materialized view in stored procedure as I haven't found an info on it.
Thanks
PetrHi chudapet,
Whenever you do operation in procedure you need to have direct grants and not via a role.
Most probably the grant to create materialized view is available via a role to your user.
Assign direct grant to the user:
grant create materialized view to scott;
{code} -
To increase performance of refresh of Materialized View
Dear Members,
I have a set of 231 Materialized Views on a remote database from which I am refreshing data through materialized views. I.e. I have 231 materialized views which are directly copying data from the source views into our internal databases. (basically select column1, column2.... from viewname@dblinkname) There are no where clauses in any of the tables. The refreshes take around 4 hours to run. They either get fast refreshed or complete refresh. It's an on-demand type of refresh.
Could anyone give me suggestions of improving the performance of these refreshes? I would appreciate some guidance in this case.
Kind Regards,
SuhasHi Suhas,
If you are asking about Coherence database integration, you could start here ...
http://coherence.oracle.com/display/COH34UG/Read-Through,+Write-Through,+Write-Behind+and+Refresh-Ahead+Caching
Thanks -
Hi all,
I have two database .there is one table in first database.I want to synchronize this table with second database. for that i have created materialized view but when i am create that materialized view it gives following error
ORA-12054: cannot set the ON COMMIT refresh attribute for the materialized view
I m access table from first table to second database by database link.
How can resolve this error? Kindly give suggestion.
Thanks in advance.From the document.
Refresh Materialized Views
Oracle maintains the data in materialized views by refreshing them after changes are made to their master tables. The refresh method can be incremental (fast refresh) or complete. For materialized views that use the fast refresh method, a materialized view log or direct loader log keeps a record of changes to the master tables.
Materialized views can be refreshed either on demand or at regular time intervals. Alternatively, materialized views in the same database as their master tables can be refreshed whenever a transaction commits its changes to the master tables. -
Performance issue accessing Materialized Views
Hi All
I am extracting source data from Materialized View through DBLink which is having record count of 1500000 rows.
But its taking lot of time(Approx. 30-45 min) during loading.
Is there any other way to load the data in a faster way??
regards
GourisankarHi,
I take it the simple 'Select from "materialized view' doesn't take this long. This could be down to the issue when issuing an 'INSERT' statement using a database link, even if you use the Optimizer hint 'DRIVING_SITE' does not help. The problem is that when issuing an INSERT statement using a DB LINK the filtering of records does not happen on the far side of the link. All the data is moved across the link to the target db, and then filtered etc.
One way to get round this is to use a pipelined function to run your select to get your values, then call the pipeline function via ODI.
Still use the DIRVING_SITE optimizer hint in the pipelined function when selecting your data.
Cheers
Bos -
Transform 3D to 2D Data via a Materialized View
Hi,
I'm playing with Geoserver against an Oracle Locator database. Things are starting well, but I did notice a bug where 3D points and lines are not supported. I guess this is an issue with GeoTools. Anybody have a way to transform my 3D data to 2D. Since I do use the 3rd dimension for storing elevation, I don't want to lose the data. So I was thinking that I could create materialized views to "virtually strip" the 3rd dimension. Any thoughts? I'm not very strong in PL/SQL, so any code hints would be greatly appreciated as well.
Thanks!
JeffI would say the compiled pl/sql would be faster (it would also depend on whether you compiled to the pl/sql virtual machine code - MP-code or the machine-dependent code of the host's C compiler if you chose native copilation): I am coding a Java version of my GEOM.SDO_CENTROID function so will be in a better position to say, categorically, one way or the other.
In my free pl/sql packages there are these functions in case anyone is interested:
-- @function To_2D
-- @precis Converts a 3D geometry to a 2D geometry
-- @version 2.0
-- @usage v_2D_geom := geom.To_2D(MDSYS.SDO_Geometry(3001,....)
-- @history Albert Godfrind, July 2006, Original Coding
-- @history Bryan Hall, July 2006, Modified to handle points
-- @history Simon Greener, July 2006, Integrated into geom with GF.
Function To_2D( p_3D_geom IN MDSYS.SDO_Geometry )
Return MDSYS.SDO_Geometry deterministic;
-- @function To_3D
-- @precis Converts a 2D geometry to a 3D geometry
-- @version 1.0
-- @usage v_3D_geom := geom.To_3D(MDSYS.SDO_Geometry(2001,....),50)
-- @history Simon Greener, May 2007 Original coding
Function To_3D( p_2D_geom IN MDSYS.SDO_Geometry,
p_default_z IN NUMBER := NULL)
Return MDSYS.SDO_Geometry deterministic;
/** @Function : FIX_3D_Z
** @Precis : Checks the Z ordinate in the SDO_GEOMETRY and if NULL changes to p_default_z value
** @Note : Needed as MapServer appears to not handle 3003/3007 polygons with NULL Z values in the sdo_ordinate_array
** @History : Simon Greener - JUNE 4th 2007 - Original Coding
Function Fix_3D_Z( p_3D_geom IN MDSYS.SDO_Geometry,
p_default_z IN NUMBER := -9999 )
Return MDSYS.SDO_Geometry Deterministic;
/** Function just to change a single point coded in sdo_ordinates to sdo_point representation
* @param p_geometry A sdo_geometry object.
Function ToSdoPoint ( p_geometry in MDSYS.SDO_Geometry )
return MDSYS.SDO_Geometry Deterministic;Simon -
Data for Classification View in Material Master
Dear all,
Can someone tell where the data for classification view is stored ??
We are running a BDC and need to check whether classification view is maintained or not ??
Thanks in Advance
Regards,
Vivek KHi,
Check the table MARA, there is a Field VPSTA. in this field the Material views will be stores with single charecters. so check for the Clasification view charecter
also it's PSTAT in MARA and MARC.
Work scheduling A
Accounting B
<b>Classification C</b>
MRP D
Purchasing E
Production resources/tools F
Costing G
Basic data K
Storage L
Forecasting P
Quality management Q
Warehouse management S
Sales V
Plant stocks X
Storage location stocks Z
Regards
Sudheer
Message was edited by:
Sudheer Junnuthula -
ORA-01031 with materialized view in stored procedure
USER1 has created a materialized view (MV). The MV is owned by USER2. USER1 needs to query the MV from within a stored procedure. How do I avoid the ORA-01031?
Here's the illustration:
SQL> show user
USER is "USER1"
SQL> CREATE MATERIALIZED VIEW USER2.ROLL
2 BUILD IMMEDIATE
3 REFRESH COMPLETE WITH ROWID
4 ON DEMAND
5 AS
6 select * from user2.test_roll;
Materialized view created.
SQL> select status,owner,object_name,object_type where OBJECT_TYPE='MATERIALIZED VIEW';
STATUS OWNER OBJECT_NAME OBJECT_TYPE
VALID USER2 ROLL MATERIALIZED VIEW
SQL> select count(*) from user2.roll;
COUNT(*)
959485
SQL> declare
2 n number;
3 begin
4 select count(*)
5 into n
6 from user2.roll
7 where rownum<100;
8 dbms_output.put_line(n);
9* end;
SQL> /
99
PL/SQL procedure successfully completed.
SQL> create procedure test_mv is
2 n number;
3 begin
4 select count(*)
5 into n
6 from as400_snpsht.roll
7 where rownum<100;
8 dbms_output.put_line(n);
9 end;
10 /
Warning: Procedure created with compilation errors.
SQL> select text from user_errors where name like 'TEST_MV';
TEXT
PL/SQL: ORA-01031: insufficient privileges
PL/SQL: SQL Statement ignored
So the point is:
* Ad hoc sql works on the MV
* Anonymous pl/sql works on the MV
* Stored procedure fails compilation with ora-01031
Any suggestions are appreciated.Sorry; In may example 'as400_snpsht' should have been 'USER2' (the owner of the MV). I changed the real user names to USER1, USER2 to make the example clearer but missed that one.
I meant to say...
SQL> create procedure test_mv is
2 n number;
3 begin
4 select count(*)
5 into n
6 from user2.roll
7 where rownum<100;
8 dbms_output.put_line(n);
9 end;
10 /
Warning: Procedure created with compilation errors.
SQL> select text from user_errors where name like 'TEST_MV';
TEXT
PL/SQL: ORA-01031: insufficient privileges
PL/SQL: SQL Statement ignored -
Terminator missing in materialized view diff script
Is this a known issue? I'm on Version 4.1.0.18:
When a difference in a materialized view is found, the generated script does not include a semicolon between the CREATE MATERIALIZED VIEW and the COMMENT ON statements. Is has to be manually added to the script.
The export DDL works fine.Thank you for the reply.
So, once the materialized view is refreshed, the previous data will be cleared, right? I wanted to store old data and add new data at the same time, but it seems to be impossible.
In our environment, table Log1 and Log2 are used alternately. So, once 14 days data are stored in Log1, new log data will be written into Log2 table and after another 14 days, the new log data will be written in Log1 Table. So, Maximum 28 days data can be stored. -
We have had Oracle RAC 2 Groups (master and slave).
We have created materialized from slave to master. and I have created materialized view log on master .
When slave group job is broken a long time(12 Hrs). We refreshed job and runned job id.
But I have found database on materialized view (slave) different from TABLE on master group. (m$log =0row)
Please tell me how can we resolve Or because that problem is m$logYes I do have a unique identifier on each record in the base table and therefore also in the MV.
So now the Downstream application has to update some of its own database tables based on what is in the MV that I provide - just so I understand how would that work e.g.:
1. MV gets refreshed from my base table every minute
2. Some records are newly inserted and some simply updated
and this is the part I don't understand (I might be missing something obvious)....
3. Downstream application interrogates the MV every (say 1-2 minutes) and updates its own tables based on the data there.....but let's say MV contains 10,000 records and in the last minute 100 of those records have been updated and another 100 inserted - how will it know the 200 records it needs to pull?
Thanks again -
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
thxMVs have properties for refresh - you an refresh based on schedules or when dependent data is committed or manually.
Cheers
David
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