In physical layer, you have a join between Dim 1 and Dim 2, Dim1 and DIm3, Fact and Dim1. In BMM for Dim1, in the sources, add Dim2 and Dim3. You may add both these dimensions in one single LTS if the data is not duplicate in the tables. In case the data is duplicated add them as seperate LTS in the sources for Dim1. Refer this post for reference -- Logical Table source source query
In BMM you need a join between Dim1 and Fact. Basically your Dim1 is sourced from three different tables which are your dimensions. This would transform your snowflake into star. In your presentation layer you will have all the columns from your dimensions (except for the duplicates, lets say you have column A in both dim1 and dim2, you should map this column in column mapping tab so as to enable BI server to pick the most economical source) and facts.
Hope this clears your question.

Similar Messages

Star schema or Snowflake schema

Hi Gurus,
I have following dimensions and fact table. let me know can I go ahead with star schema and snowflake schema while building the cube.
1. Country's table
2. workgroup table --> each country have N number of work groups
3. user table---> each workgroup have N number of users.
4. time table.
5. fact table.

This is a similar thread that discusses on the design approach of star vs normalized tables
https://social.technet.microsoft.com/Forums/sqlserver/en-US/7bf4ca30-a1bc-415d-97e6-ce0ac3137b53/normalized-3nf-vs-denormalizedstar-schema-data-warehouse-?forum=sqldatawarehousing
In my experience majority of cases I've some across is also star schema for data marts where tables will be more denormalized rather than applying priciples of normalization. And I believe so far as its through SSAS cubes that you exposes the OLAP model
it would be much easier to implement relationships using a denormalised approach.
What you may do is to have a normalised datawarehouse if you want and then built the datamarts over it using denormalised tables (star schema) for the cube.
Please Mark This As Answer if it solved your issue
Please Vote This As Helpful if it helps to solve your issue
Visakh
My Wiki User Page
My MSDN Page
My Personal Blog
My Facebook Page

How can i access all the objects of one schema from another schema

Dear All,
How can i access all the objects(Tables,Views,Triggers,Procedures,Functions,Packages etc..) and do the modifications of one schema from another schema (Without using synonyms concept).
Thanks in advance,
Mahi

First of all, synonyms only help you easy reference the object. It doesn't have any implication of object privilege.
As long as you have proper privilege on target object. You can access it with or without synonyms.
Assuming you have proper privilege of objects, you can use following command to assume schema owner.
ALTER SESSION SET CURRENT_SCHEMA = Schema_owner

Star schema versus snowflake schema

I have a question regarding dimensional data modeling. My question here is, when star schema model would be useful and when snowflake schema model would be useful.
In star schema, we have only fact and it is connected with dimensions. But in snowflake schema, we are normalizing dimension into one more level. Let us say, we have dimension product. Product can be normalized into another table called supplier. Let us take another example, customer dimension. Customer dimension can be normalized into country…
Advantage of star schema is, easy to write the query since we have only less tables. You do not need to join multiple tables when we write the query. It would improve the performance some time.
Advantage of snowflake schema is, it is little complex to write the query, since we have to join multiple tables. Performance might improve some time when we join smaller tables…
My question is, at what circumstances, we can use star and snowflake schema? I am not able to define the word sometime_
Any help is highly appreciated…

Hi,
There is a trade off on the availability and the Complex analytics.
A star schema is good if you have the functional requirements really simple. Like the dimension is not SCD Type2 (slowly changing dimension) and you don't need to do "AS IS" vs "AS WAS" reporting.
In modern Analytics in any domain dimensions are SCD Type 2 as business keep on evolving. In a star schema structure this will cause explosion of data if there are frequent changes at the higher levels of the dimensional hierarchy. That anyway will hit the performance.
As far as my experience goes, at the data model level it is better to have snow flaked dimensions. and while managing the metadata (in a BI reporting tool) you can consolidate the snowflaked dimensions in star schema structures. That will make ah hoc analytics much simple for the business users.
A lot of performance measure can be taken to improve the end user experience.
In short the trend in BI analytics demands to have a snowflaked structure rather than a simple star schema structure.
Hope this helps.

How to defer constraint of one schema from another schema

Hi All,
I am having a requirement of migrating data from one schema(SCHEMA_A) to another schema(SCHEMA_B). So I tried to implement the same using PL/SQL.
Because of foreign key contraint while migrating child table, Oracle throws an error message like parent key not available.
So I tried to set the all contraints to deferred and after completion of migration i planned to set all the contraints to immediate.
But Here I am executing the procedure from schema(SCHEMA_C) which has rights to access SCHEMA_A and SCHEMA_B.
How could I able to defer all the constraint in SCHEMA_B from SCHEMA_C?
Thanks in Advance,
Antany.

Yes,
You could run something like this, for foreign keys:
BEGIN
FOR cur_rec IN (SELECT table_name, constraint_name FROM DBA_CONSTRAINTS WHERE OWNER = <owner> AND CONSTRAINT_TYPE = 'R' )
    LOOP
      EXECUTE IMMEDIATE 'ALTER TABLE <owner>.' || cur_rec.table_name || ' DISABLE CONSTRAINT ' || cur_rec.constraint_name;
    END LOOP;
END;
/

Create a new schema from existing schema

Hi, I'm wondering whether there is a way of create a schema from
existing one? Could it done through SQL statement or have to go
through some sort of tools? Please drop me a few words if you
know the answer. Thanks.

Hi,
U can do that in a few steps.
First create the User.
Then Go to the Source User and grant him create any table privs.
Then write a Sql Stmt to generate the necessary scripts and run it.
The other way would be to grantr the newuser select on all the tables and then run that script from his account.
Regards,
Ganesh R

Trying to create 3 schemas from one schema

DB version : 11.2.0.2 Enterprise Edition
Platform : RHEL 5.6
I have an expdp dump of a schema (HRTB_AP_PROD). I wanted to create 3 schemas from this dump in one go. So i tried this
## The parfile I used
DIRECTORY=DPUMP_DIR
DUMPFILE=HRTB_AP_PROD%u.dmp
LOGFILE=TheThreeSchemas-imp.log
remap_schema=HRTB_AP_PROD:HRTB_AP_DEV1
remap_schema=HRTB_AP_PROD:HRTB_AP_DEV2
remap_schema=HRTB_AP_PROD:HRTB_AP_DEV3
exclude=statistics
parallel=2
nohup impdp \'/ as sysdba\' parfile=impdp-aug23.par &But i encountered
ORA-39046: Metadata remap REMAP_SCHEMA has already been specified.When I googled it found the following link in which Dean Says , it is not possible.
Re: one dump file inport into multiple schema
So, I had to run 3 separate imports (impdp) to do this.
This is a bit wierd. I am surprized that Oracle guys haven't done anything about this . This is like DB2 !

Is there a question in your post or are you just letting us know the obvious?
:p

Modeling Star Schema From Transactional Schema

My requirement is to model the BMM from a Transactional Schema. When creating the joins in the physical layer for example between the Customer and Orders table would I join the 2 tables on Customer ID and pay attention to the one to many relationship between a customer and orders or would I need to defined which table is the fact table and which table is the dimesion table before creating the joins in the physical layer.

I would suggest to write a physical query to generate report like year, customer,product wise #of order and order items. Based on that try to creat joins and the bmm schema. I would say this the best approach.
Or else look for the table which having more foreign keys to other tables that would be the center located table.
Pla mark if helps.

To kill session in one schema from another schema

Hi Team,
I got a problem like a table from one of my schema has been locked. I am getting 'ORA-00054: resource busy and acquire with NOWAIT specified' error when trying to delete rows from that table or even when trying to truncate that table.
Let the table be 'T1' present in schema 'VIEW'
I tried to kill the session which is active for that schema by below query
select sid,serial#,status from v$session where username='VIEW' and STATUS = 'ACTIVE';
alter system kill session '681,2586';
But i couldn't do the above as i don't have DBA privilege for that. But i have DBA privilege for another schema let it be 'ADMIN'
Now how can i kill the session in schema 'VIEW' from schema 'ADMIN'
can any one get me solution.
Thanks in Advance
11081985

I got a problem like a table from one of my schema has been locked. I am getting 'ORA-00054: resource busy and acquire with NOWAIT specified' error when trying to delete rows from that table or even when trying to truncate that table.
Before you do anything why don't you actually find out WHY that table has been locked.
You generally should NOT be killing sessions without knowing what is causing the problem to begin with.
Then you also need to determine if you should use KILL SESSION or instead use DISCONNECT SESSION and well as whether the use of IMMEDIATE is appropriate.
Each of those choices acts differently. Many people use KILL when they should really use DISCONNECT.
See DISCONNECT SESSION Clause and KILL SESSION Clause in the ALTER SESSION chapter of the SQL Language doc
http://docs.oracle.com/cd/E11882_01/server.112/e17118/statements_2014.htm#i2282145

How to rename AW of one schema from another schema?

Hi Folks,
I am trying to rename an Analytical workspace which is in Schema1 from the SYSTEM schema as given below but getting the error "ORA-03001: unimplemented feature"
Enter user-name: system
Enter password:
Connected to:
Oracle Database 11g Enterprise Edition Release 11.2.0.3.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
SQL> alter session set current_schema = Schema1 ;
Session altered.
SQL> execute dbms_aw.aw_rename('AWNAME','AWNAME_BKP');
BEGIN dbms_aw.aw_rename('AWNAME','AWNAME_BKP'); END;
ERROR at line 1:
ORA-03001: unimplemented feature
ORA-06512: at "SYS.DBMS_AW", line 1050
ORA-06512: at "SYS.DBMS_AW", line 1073
ORA-06512: at line 1Any solutions for this?
Thanks,
Prabhu

Westh,
Yes this code appears to be correct. Was that your question?
--Ric

Approach schema from another schema's datasource

I have a datasource DS1 to a schema1 in Database1.
There also is a schema2 in another database Database2.
Is there a way to read/update/write data in schema2 through DS1.
I need this because of global transactions.
Database is oracle 10g.

I have no idea what you mean with datasource DS1, but you can access objects in another database through database links. This way you will use the dirstibuted transaction features build-in oracle.
Peter

BMM layer creation (Star Schema Physical Layer) - What to add/not add?

Hi All,
I am just looking for any general feedback on the thought/question below.
I am setting out on creating my first BMM layer and trying to determine what I need to do in this layer that will be different and add value from what I already did in the physical layer. My data model is already defined as a star schema within my data mart source. So in the physical layer I have my facts imported along with the dimensions and I have joined them together as needed. Here is what I think I will setup as I move into the BMM layer:
1. I will add heirarchies as needed to enable drill down within my reports
2. I will need to add my calculations/measures to allow for any type of metric to be returned through a request in Answers
3. I do not see a large need to create logical tables (at least not yet) based on multiple physical source tables as my source is already a star schema and dimensionally modeled. For users that also already source a star schema at the physical layer .. do you find that you do a lot of logical table creation/mapping to add functionality or does your BMM look a lot like you Physical Layer?
Other than steps 1 and 2, I am not really sure how much additional manipulation I might do from the Physical to BMM layer since my Physical is already a star schema. Am I missing anything? Obviously everyone's data model and circumstances are different but I wasn't sure if maybe there were some good thoughts on what I might be missing (if anything)?
One last question .. I am not currently planning to use any aliases at the Physical Layer but I do plan to rename the tables at the presentation layer to be more business verbage like. Why are others using aliases?
Thanks in advance for the help.
K

Alastair, thanks for the advice. I'll definitely keep that in mind as I start to build out the BMM.
One question/issue I just ran into as I was wrapping up my Physical Layer mapping. When I check for global consistency, I am getting an error that is complaining that I have multiple joins defined between the same two tables (which I do). This is because I have the following setup:
TBL_A_FACT
F_ID_HIT
F_HIT_DESC
F_ID_MISSED
F_MISSED_DESC
TBL_B_DIM
F_ID
F_DESC
Table A joins to Table B in two ways:
TBL_A_FACT.F_ID_HIT = TBL_B_DIM.F_ID
TBL_A._FACT.F_ID_MISSED = TBL_B_DIM.F_ID
The F_IDs can be either hit or missed on any given fact record and the total distinct set exist in the dimension.
When I define two foreign key joins in the physical layer based on the relationship above and check Global Consistency, I get an error saying that "TBL_A and TBL_B have multiple joins define. Delete duplicate foreign keys if they exist" and it is listed as an error. I guess this makes sense because when the two tables are used in a request OBIEE would need to know how to join them (using the hit or missed field). What is the best approach for handling this..
- Should I define TBL_A twice in the physical layer as:
TBL_A (Alias TBL_A_HIT)
F_ID_HIT
F_ID_HIT_DESC
TBL_A (Alias TBL_A_MISSED)
F_ID_MISSED
F_ID_MISSED_DESC
Or do something like the above in the BMM layer?
Thanks for the help!
K
And then establish the relationships using these separate tables?

Bpel: problems importing schema from http-url

i have problems importing the schema "http://schemas.xmlsoap.org/ws/2003/03/addressing/". I'm using JDeveloper 10.1.3.3.0.4157 and SoaSuite 10.1.3.1.0 with the patch 10.1.3.3.0.
The problem can be reproduced very easily:
* create a new "BPEL Process Project" from template "Synchronous BPEL Process" and use all default settings
     -> deploying to my local app-server works
* add a new variable to the process
     * select "Element" as type
     * click "Browse Elements..."
     * click "Import Schema File..."
     * enter "http://schemas.xmlsoap.org/ws/2003/03/addressing/"
     * select "Imported Schemas/addressing/EndpointReference"
     * finish creating variable
* save all and deploy
     -> the ant console shows the following error:
BUILD FAILED
C:\oracle\JDeveloper\jdev\mywork\TejTest\BPELProcess1\build.xml:79: A problem occured while connecting to server "127.0.0.1" using port "8888": bpel_BPELProcess1_1.0.jar failed to deploy. Exception message is: ORABPEL-05215
Fehler beim Laden von Prozess.
Bei der Prozessdomäne sind folgende Fehler beim Laden des Prozesses "BPELProcess1" (Revision "1.0") aufgetreten: BPEL-Validierung nicht erfolgreich.
Validierung der BPEL-Quelle nicht erfolgreich. Fehler:
[Fehler ORABPEL-10902]: Kompilierung nicht erfolgreich
[Beschreibung]: in "bpel.xml", XML-Parsing nicht erfolgreich. Grund "nicht definiertes Teilelement.
In WSDL-Datei bei "file:/C:/oracle/product/10.1.3.1/OracleAS_1/bpel/domains/default/tmp/.bpel_BPELProcess1_1.0_c64929dfd2dacf95db3c9da081c1797d.tmp/BPELProcess1.wsdl" ist das Teilelement der Nachricht "{http://xmlns.oracle.com/BPELProcess1}BPELProcess1ProcessRequest" in keinem der Schemas definiert.
Vergewissern Sie sich, dass die Schreibweise des QName-Elements korrekt ist und dass der WSDL-Import vollständig ausgeführt wurde.
[Mögliche Behebung]: n/v.
Wenn Sie ein Patch auf dem Server installiert haben, stellen Sie sicher, dass die bpelcClasspath-Domäneneigenschaft die Patch-Klassen enthält.
at com.collaxa.cube.engine.deployment.CubeProcessHolder.bind(CubeProcessHolder.java:285)
at com.collaxa.cube.engine.deployment.DeploymentManager.deployProcess(DeploymentManager.java:862)
at com.collaxa.cube.engine.deployment.DeploymentManager.deploySuitcase(DeploymentManager.java:728)
at com.collaxa.cube.ejb.impl.BPELDomainManagerBean.deploySuitcase(BPELDomainManagerBean.java:445)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
sorry for the german message, i couldn't get the english version. basically it says that "{http://xmlns.oracle.com/BPELProcess1}BPELProcess1ProcessRequest" is not defined in any schema, what is very strange because before importing the schema from http..., the element ...BPELProcess1ProcessRequest has been found.
another strange thing is that if i download the schema from http://schemas.xmlsoap.org/ws/2003/03/addressing/ and import it from a local file, everything works as expected.

When importing a schema there are two attributes to the import element to be aware of: namespace and schemaLocation. I think this is the basis of confusion, particularly where the same value is used for both in this case.
I suspect that the schema import works for ax90033 because the schemaLocation is being specified as "http://schemas.xmlsoap.org/ws/2003/03/addressing/".
The W3C has some further information on this at http://www.w3.org/TR/2004/REC-xmlschema-1-20041028/structures.html#element-import which gives an indication of the complexity that lies behind schema imports.
Peter
http://soastation.blogspot.com

Administrate Objects in Schema by Another Schema

Hi,
I am in a scenario to give administer privilege on one schema to another schema only.
Let me exxplain my scenario with an example.
I have a schema named HR in my database. Now I have create another schema named SH.
Now I need to do all operations like create table, create procedure etc on HR schema from SH schema.
And please note that I can't give create any table, create any procedure etc as it will be a big security breach.
Please help me to sort out this issue.
Regards,
Savad

user9292816 wrote:
Hi,
I am in a scenario to give administer privilege on one schema to another schema only.
Let me exxplain my scenario with an example.
I have a schema named HR in my database. Now I have create another schema named SH.
Now I need to do all operations like create table, create procedure etc on HR schema from SH schema.
And please note that I can't give create any table, create any procedure etc as it will be a big security breach.
AFAIK , without create any table/ or any any super privilege like DBA etc , you cannot achieve this.
Regards
Rajesh

Design Fixed Assets Star Schema from OLTP DB

Hi,
Scope : Design Fixed Assets logical Star Schema for Demonstrate with OLTP tables
Our platform is Oracle 10g Forms and Reports deployed on Oracle 10g App Server._ At the moment we don’t have data warehouse constructed. We are pumping OLTP Data into Staging DB thru jobs and then by using materialized views getting the data in DWH DB which is in progress.
OBIEE 10g installed and working fine for testing.
We are planning to implement OBIEE for Reporting. As a starting point I would like to design Fixed Assets star schema to demonstrate FA reports in OBIEE from OLTP Tables.
FA- OLTP Tables:_
AC_UNIT_MASTR           – Business Units
AC_ACNT_MASTR           - Nominal Codes
AC_COST_CENTR_MASTR      - Departments
AC_MANTN_ASTS           - Assets transaction table
AC_AST_BAL_DETLS           – Period wise Asset summary
AC_AST_BAL_DETLS_V      - View
To achieve this
1).Import tables in physical layer and set physical joins
2).identify and create dimensions and set complex joins and then move to presentation layer.
Please suggest best approach to design Repository
Thanks
Regards,
Kulkarni
Edited by: hai_shailesh on Jan 25, 2012 11:36 PM
Edited by: hai_shailesh on Jan 25, 2012 11:38 PM
Edited by: hai_shailesh on Jan 25, 2012 11:39 PM

Hi Saichand,
Thanks for the response.
Already i referred that doc and completed practically. now i have to work on Finance data . as a starting point working with Fixed Assets module. already i designed centralised fact with dimensions as below
in physical&BMM layer defined relationship as below()
AC_UNIT_MASTR_D                  --> AC_AST_BAL_DETLS_F
AC_ACNT_YEAR_MASTR_D        --> AC_AST_BAL_DETLS_F
AC_ACNT_PERD_MASTR_D        --> AC_AST_BAL_DETLS_F
AC_COST_CENTR_MASTR_D      --> AC_AST_BAL_DETLS_F
AC_AST_GRP_MASTR_D            --> AC_AST_BAL_DETLS_F
AC_AST_SUBGRP_MASTR_D      --> AC_AST_BAL_DETLS_F
and
AC_ACNT_YEAR_MASTR_D        --> AC_ACNT_PERD_MASTR_D
When iam trying to create a dimension for Periods(AC_ACNT_PERD_MASTR) , Periods dimesnion created with two tables
AC_ACNT_YEAR_MASTR_D,AC_ACNT_PERD_MASTR_D
Please advice..
Regards,
Kulkarni

Creation of star schema from snowflake schem in BMM layer

Similar Messages

Maybe you are looking for