Relational vs. multidimensional Cubes

Hi,
could anybody please tell me why I would want to create a cube that is stored relationally as opposed to into an AW? (like e.g. Warehouse builder offers to do) How would I be able to aggregate data read into it? And, how would I be able to access it in the end? Would I be able to display it in Oracle Discoverer OLAP??? Thanks in advance.

Hi,
In my experience, to the end user, discoverer looks exactly the same wether you use relational storage or multidimensional. When you have low amounts of data the query performance is also very good when you are using relational.
When you are getting larger amounts of data things will slow down to turtle speed. If you create multidimensional cube and fully aggregate it, the query performance will continue to be good.
Might not answer all of your questions but hopefully some of them.
regards Ragnar

Similar Messages

Accessing Analysis Services MultiDimensional cube data with Power View in Excel

At this point in time, does Power View in Excel have the ability to connect directly to an Analysis Services multidimensional cube?
If not, is this functionality expected in the near future?
davidg12

Hi,
As far as I known, the Power View for Excel does not support the feature yet, please see this article:
https://msdn.microsoft.com/en-us/library/jj969574.aspx
I copied part of the article here:
Native support for Power View
With this release, multidimensional models support analysis and visualization by using Power View in SharePoint mode. No special configuration of your multidimensional models is necessary. There are however some differences in how multidimensional model
objects are displayed in Power View compared to other client tools such as Microsoft Excel and Microsoft Performance Point.
This release does not support analysis and visualization of multidimensional models by using Power View in Excel 2013.
====
We may use Power View for SQL Server 2014. For more detail information, please refer to the following link:
http://blogs.msdn.com/b/user_ed/archive/2014/01/02/business-intelligence-in-sql-server-2014-power-view-for-multidimensional-models.aspx
Hope it's helpful.
Regards,
George Zhao
Forum Support
Come back and mark the replies as answers if they help and unmark them if they provide no help.
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Obiee 11g multidimensional cubes are very slow

Hi,
I've noticed that navigation in multidimensional cubes by obiee11g is very very slow, above all in comparison with the microsoft excel plugin.
I've Essbase 11.1.3 (I hope to remind well) and obiee 11.1.1.3.0.
Someone have the same problem?
Thanks

HI Andy ,
Observer the similar kind of performance problem in OBIEE 11g with Oracle Cube build using AWM 11g version .
The same cube access using OBIEE 10g repository is very fast .
I have seen one of my 10g report coming within 30 secs where in 11g it is even hard to come on before 5 minutes .
Just have seen in SR that there are inherent problem of OBIEE 11.1.1.5 version regarding the performance and Oracle asked to apply couple of patch to fix the behavior .
Regards,
DxP

Drill Across Essbase/Multidimensional cubes with a conformed dimension

Hi Guys,
Does anyone have any ideas/pointers on how to implement drill across on Essbase cubes or Multidimensional sources in general.
For Eg:
Cube 1 with aggregate data at Country Level
Cube 2 with detail data at City Level
Geography is the conformed dimension here.
I need to implement drill across from the Country level in the Geography Hierarchy to go to the City level, across cubes. Facing a problem desinging it in the BMM.
Any help would be appreciated.
thanks,
jboy

We're discussing this already in your other thread? Different drill paths for a common Essbase Dimension with varied depth
Close this one please...not necessary.
Cheers,
C.

Chars & kf's related to virtual cube not get updated via multiprovider

Hi Friends,
              I've got one multiprovder, which has got two infocubes, one is 0CFM_C10 & ZRATES, in these one is basic infocube and the other one is virtual cube. So i've built the query on multiprovder which gets data from two infocubes basic and virtual, but when i'm trying to restrict in the query, the chars & kf's which are related to virtual infocube are not getting data, but the chars related to basic infocube getting data.
               NOTE: i've checked virtual cube by choosing the "display data" option, here it is showing, bt via multiprovder it's getting updated, even i can't see the data for those chars in multiprovder also using "display data" option,
what would be the problem? why virutal cube data isn't getting updated?
any idea's
awaiting for your responce

Hi Siggi,
        Thanx for your replay, actually the chars & kf's related to virtualcube are not in basic cube know! and also the query requirement is to get data from two cubes, i think in that case, not required to restrict at infocube level using 0infoprovider,
             i can be able to see the data in virtual cube, but it's getting vir multiprovider, the assignment in multiprovider is right,
then what would be the problem?
Regards,
BalajiReddy

Relational Vs Multidimensional database

Hi gurus,
Can you please explain me the difference Relational & Multidimensional databases.how tables are linked in both.
But Not the advantages of Multi dimensional DB over the relational DB.
Regards
Ganesh

Hi,
The key to understanding the relationship between DM and ER is that a single ER diagram breaks down into multiple DM diagrams. Think of a large ER diagram as representing every possible business process in the enterprise. The master ER diagram may have Sales Calls, Order Entries, Shipment Invoices, Customer Payments, and Product Returns, all on the same diagram. In a way, the ER diagram does itself a disservice by representing on one diagram multiple processes that never coexist in a single data set at a single consistent point in time. It's no wonder the ER diagram is overly complex. Thus the first step in converting an ER diagram to a set of DM diagrams is to separate the ER diagram into its discrete business processes and to model each one separately. The second step is to select those many-to-many relationships in the ER model containing numeric and additive nonkey facts and to designate them as fact tables. The third step is to denormalize all of the remaining tables into flat tables with single-part keys that connect directly to the fact tables. These tables become the dimension tables. In cases where a dimension table connects to more than one fact table, we represent this same dimension table in both schemas, and we refer to the dimension tables as "conformed" between the two dimensional models.
The resulting master DM model of a data warehouse for a large enterprise will consist of somewhere between 10 and 25 very similar-looking star join schemas. Each star join will have four to 12 dimension tables. If the design has been done correctly, many of these dimension tables will be shared from fact table to fact table. Applications that drill down will simply be adding more dimension attributes to the SQL answer set from within a single star join. Applications that drill across will simply be linking separate fact tables together through the conformed (shared) dimensions. Even though the overall suite of star join schemas in the enterprise dimensional model is complex, the query processing is very predictable because at the lowest level.
Regards
Vinod

Question related to building cube

Hi, we are in the stage of developing the cube by understanding the report requirements.
we have 7 dimensions in our cube in which for some reports the metadata exists from all the dimensions and for some reports(expenses),the source data is through the 5 dimensions only.
My question is
1)Is it required to maintain seperste cube for expense cube?
2)If we maintain in the same cube,after loading data through the 5 dimensions,how the aggregation happend towards other 2 dimensions?

Hi,
1. My understanding is : YOu have got a cube with 7 dimensions and their is some sort of reporting which is happening as of now.
2. You have another requirement, i.e expense type, where your report needs only data from 5 dimensions ,where as your cube has 7 dimensions in total.
3. If this is the scenario, then you need not create a new cube to cater to the needs of your expense requirement. Cube works in combinations,which are unique.
Let me explain you with an example
YOu have got 5 dimension, but your expense has source data only for time, accounts and type dimensions. You can load the data into 7 dimension by adding unknown as the members to other 2 non-required dimensions ,and pull out a report by selecting only 3 dimensions.
Time
-jan
-feb
-march
Accounts
-manpowercost
Type
-Expense
-xyz.
Region
-A
-B
service offering
-L
-M
How does it consolidate?
Lets take few combinatinos from above outline
jan,manpowercost,expense,unknown,unknown.,100
jan,manpowercost,xyz,A,L,200
..etc
these 2 values will never overlap ,as they are all together different combinatins and the same way aggregations also will not impact and provide dubious data
Hope it helps, pls revert for further clarity
Sandeep Reddy Enti
HCC
http://hyperionconsutlancy.com/

Powerview modifying a calculated measure in SSAS cube

We are running SQL Server 2012 and Sharepoint 2013 we are having problems with Powerview modifying a calculated measure in the underlying multidimensional cube. We have a powerview report with multiple pages that allows a user to utilize a global filter
to view the financial performance of particular customers on multiple reports/pages. When the user picks a different customer, one of the calculated measures, in this case gross margin percent, is essentially stuck. It does not change when the customer selection
changes. It remains the gross margin percent as the previous customer. All of the other measures change appropriately. Measures such as sales, expenses, ebitda and the other measures that are columns in the relational sql server db feeding the cube are fine.
Only the calculated measures defined in ssas are not working. I then tested the molap cube on a clean connection to a new excel sheet and was shocked to find that the same value the power view report is stuck on is also displayed in the excel file! It
has essentially modified the data in the cube! The only way to clear the value and display the correct calculation is to re deploy the cube. Any one here know what to do to resolve this?

Hi Osu75,
According to your description, you create a PowerView report using SSAS cube as the data source in SharePoint site, the problem is that when changing the selection in the global filter, it change the calculated measure in the underlying multidimensional
cube, right?
In your scenario, which script are you using when creating this calculated measure? Generally, report is used to display data from underlying database, it's really strange that the PowerView report change the calculated measure in the underlying multidimensional
cube.
From a support perspective this is really beyond what we can do here in the forums. If you cannot determine your answer here or on your own, consider opening a support case with Microsoft. Visit this link to see the various support options that are available
to better meet your needs:
http://support.microsoft.com/default.aspx?id=fh;en-us;offerprophone
Regards,
Charlie Liao
If you have any feedback on our support, please click
here.
Charlie Liao
TechNet Community Support

Discovering cubes using the API

Question�
I am interested in using the Oracle OLAP (Java) API to discover the cubes in a database. However, the �Developer�s Guide to the OLAP API� states the following on pages 38-39:
Note that the OLAP metadata includes a cube object, which does not map directly to any MDM object� this type of cube object is not needed in the MDM Model.
And, in fact, I have not yet been able to find any �cube� object in the OLAP API (or indeed any direct references to cubes at all).
However, I have also read that �The OLAP API is the technology underlying the Oracle BI Beans for access to relational and multidimensional data� (p. 1-7 of the �OLAP User�s Guide�). Since the BI Beans are capable of discovering cubes, it therefore seems that the API should be capable of this as well. How is this done?
Thanks.

Hi,
IINM, user hooks are available in other modules (like Sales & Marketing, Asset Management, ..etc). If you are looking for certain module, and you cannot find the proper APIs, please log a SR.
Thanks,
Hussein

Adding a New Dimension to a CUBE

Hello
Being in new at Oracle OLAP...
If I need to add a new dimension, SHOULD I RECREATE the cube entirely again??
Is not there any other way??
Regards

Each cell in a cube is referenced by a dimension. Think of it as pointers to cells in a multi-dimensional array.
So when you add or remove a dimension, what should happen to all those cells.
In a way you are breaking the cube.
Since cube data is loaded from a table, you can always re-load your cube after adding or removing a dimension.
Dimensions are not added/removed frequently, once the design is finalized. You may add a new hierarchy to existing dimensions, which is done more frequently compared to adding a dimension. After adding a new hierarchy, you just have to re-aggregate cube data and not re-load from relational source.
Cubes are created for reporting, and can be deleted/recreated or truncated - monthly, quarterly or yearly - for various reasons.
Your source transactional detailed data should be in one (or more) fact tables and should never be deleted.
Is there any "operational" concern in a Production environment, because of which you are asking this question?
One trick could be: to create the new cube (with more dimensions or less dimensions than the original cube) and then COPY DATA from original cube into that new cube.
But it may take the same amount of time as re-loading the new cube from the relational source.

SSAS Multidimensional Time Intelligence YTD calculation showing BLANK for Date level

Hi there,
I am working with SSAS Multidimensional Cube, basically I have defined a Time Intelligence calculations for just YTD in the Cube, the calculation was created in the Calculations tab of the cube as follows:
/*Year to Date*/
[Dimension Dim Time].[Calendar Dimension Dim Time Calculations].[Year to Date],
[Dimension Dim Time].[Year].Members,
[Dimension Dim Time].[Date].Members
=
Aggregate(
{ [Dimension Dim Time].[Calendar Dimension Dim Time Calculations].[Current Dimension Dim Time] }
PeriodsToDate(
[Dimension Dim Time].[Calendar].[Year],
[Dimension Dim Time].[Calendar].CurrentMember
My Calendar hierarchy is as follows:
Year -> Quarter -> Month -> Week -> Date
The problem I have is that when I am at Date level I am not getting the cumulative YTD value, instead I am just getting blank cells:
Could anyone help me defining a Time Intelligence YTD calculation that works for all levels including the Date (highlighted in yellow above)?
Thanks and best regards,
Joss

The only strange thing is the MDX script, I would have used this one instead (sse below) - but if this is not the issue, I would suggest you to isolate the issue in a simpler MDX script removing any other calculation.
Also take a look at the DateTool solution for these calculations - I really don't like the wizard provided by the development environment, it has other issues but not something that should affect your calculation:
http://www.sqlbi.com/articles/datetool-dimension-an-alternative-time-intelligence-implementation
/*Year to Date*/
[Dimension Dim Time].[Calendar Dimension Dim Time Calculations].[Year to Date],
    [Dimension Dim Time].[Calendar].Members,
[Dimension Dim Time].[Date].Members
=
Aggregate(
{ [Dimension Dim Time].[Calendar Dimension Dim Time Calculations].[Current Dimension Dim Time] }
PeriodsToDate(
[Dimension Dim Time].[Calendar].[Year],
[Dimension Dim Time].[Calendar].CurrentMember
Marco Russo http://ssasworkshop.com http://www.sqlbi.com http://sqlblog.com/blogs/marco_russo

Problems in the creation of a MOLAP Cube with DBMS_AWM.

I want to create a MOLAP Cube with the package DBMS_AWM. So I create the ROLAP Cube and the Dimensions with the Enterprise Manager Website, and all works perfectly. Then I executed the code to create the multidimensional dimensions and the multidimensional cube (awm dimensions/cubes), but I had some problems in the first dimension.
This dimension has the name D_DESTIN, and has the following hierarchy:
+DESTIN_DESC_H3
|
+---DESTIN_DESC_H2
|
+------DESTIN_DESC_H1
|
+---------DESTIN_DESC_H0
The name of the hierarchy is H_D_DESTIN.
The following code is the code that I used to create the first multidimensional dimension:
set serveroutput on
execute cwm2_olap_manager.set_echo_on;
execute dbms_aw.execute ('aw create ''WTESTE''');
execute dbms_awm.create_awdimension('EXEMPLO_OLAP', 'D_DESTIN', 'EXEMPLO_OLAP','WTESTE', 'WD_DESTIN');
execute dbms_awm.create_awdimload_spec('D_DESTIN_LOAD', 'EXEMPLO_OLAP', 'D_DESTIN', 'FULL_LOAD');
execute DBMS_AWM.SET_AWDIMLOAD_SPEC_PARAMETER ('D_DESTIN_LOAD','EXEMPLO_OLAP','D_DESTIN','UNIQUE_RDBMS_KEY','NO');
execute dbms_awm.refresh_awdimension('EXEMPLO_OLAP', 'WTESTE', 'WD_DESTIN', 'D_DESTIN_LOAD');
commit;
execute cwm2_olap_manager.set_echo_off;
execute cwm2_olap_manager.end_log
When I executed the code above, I got the following error:
PL/SQL procedure successfully completed.
SP2-0103: Nothing in SQL buffer to run.
PL/SQL procedure successfully completed.
AMD-00001 created AWDimension "EXEMPLO_OLAP.WTESTE.WD_DESTIN"
PL/SQL procedure successfully completed.
AMD-00001 created AWDimLoad_Spec "D_DESTIN_LOAD.EXEMPLO_OLAP.D_DESTIN"
PL/SQL procedure successfully completed.
AMD-00002 set AWDimLoad_Spec_Parameter "D_DESTIN_LOAD.EXEMPLO_OLAP.D_DESTIN"
UNIQUE_RDBMS_KEY to "NO"
PL/SQL procedure successfully completed.
ERROR Create_AWDimension. Problem refreshing dimension:
WD_DESTIN
Error
Validating Dimension Mappings WD_DESTIN.DIMENSION. Key Expression
DWH.D_DESTIN.DESTIN_KEY for Mapping Group
WD_DESTIN.H_D_DESTIN.DESTIN_DESC_H0.DWH_D_DESTIN_WD_DESTIN_H_D_DESTIN
DESTINDESC_H0.DIMENSIONMAPGROUP, Level WD_DESTIN.DESTIN_DESC_H0.LEVEL,
Hierarchy WD_DESTIN.H_D_DESTIN.HIERARCHY is Incorrectly Mapped to
RDBMS.
(AW$XML) AW$XML
In SYS.AWXML!__XML_HANDLE_ERROR PROGRAM:
BEGIN dbms_awm.refresh_awdimension('EXEMPLO_OLAP', 'WTESTE',
'WD_DESTIN', 'D_DESTIN_LOAD'); END;
ERROR at line 1:
ORA-06510: PL/SQL: unhandled user-defined exception
ORA-06512: at "OLAPSYS.DBMS_AWM", line 1012
ORA-06512: at line 1
Commit complete.
PL/SQL procedure successfully completed.
PL/SQL procedure successfully completed.
I donât know what is wrong. The ROLAP Cube is valid according to Oracle Enterprise Manager Website, and it is possible to consult its data with "OracleBI Spreadsheet Add-In"
What is wrong?
Regards,
Rui Torres

I executed the same code in a different user and the MOLAP Cube was created successfully.
But, I donât know what is the privilege/role, that permits this second user to create a MOLAP cube with the package DBMS_AWM.
The privileges/roles of the first user are:
ROLES
======
CONNECT
OLAP_DBA
OLAP_USER
OWBR_EXEMPLO_OLAP
OWB_EXEMPLO_OLAP
SYSTEM PRIVILEGES
=================
ALTER SESSION
CREATE ANY PROCEDURE
CREATE DATABASE LINK
CREATE DIMENSION
CREATE INDEXTYPE
CREATE MATERIALIZED VIEW
CREATE PROCEDURE
CREATE PUBLIC DATABASE LINK
CREATE PUBLIC SYNONYM
CREATE ROLE
CREATE SEQUENCE
CREATE SESSION
CREATE SYNONYM
CREATE TABLE
CREATE TRIGGER
CREATE TYPE
CREATE VIEW
DROP ANY PROCEDURE
DROP PUBLIC SYNONYM
EXECUTE ANY PROCEDURE
GLOBAL QUERY REWRITE
SELECT ANY TABLE
SYSDBA
UNLIMITED TABLESPACE
OBJECTS PRIVILEGES
==================
Object      Privilege     |Schema |Object
=======================================================
SELECT               |SYS     |DBA_ROLE_PRIVS
EXECUTE               |SYS     |DBMS_LOCK
SELECT               |SYS     |DBMS_LOCK_ALLOCATED
EXECUTE               |SYS     |DBMS_OBFUSCATION_TOOLKIT
EXECUTE               |SYS     |DBMS_SNAPSHOT
SELECT               |SYS     |V_$LOCK
SELECT               |SYS     |V_$MYSTAT
SELECT               |SYS     |V_$SESSION
SELECT               |SYS     |V_$SYSTEM_PARAMETER
The privileges/roles of the second user are:
ROLES
======
AQ_ADMINISTRATOR_ROLE
DBA
MGMT_USER
SYSTEM PRIVILEGES
=================
CREATE MATERIALIZED VIEW
CREATE TABLE
GLOBAL QUERY REWRITE
SELECT ANY TABLE
UNLIMITED TABLESPACE
OBJECTS PRIVILEGES
==================
Object Privilege     |Schema     |Object
=============================================
EXECUTE               |SYS     |DBMS_ALERT
EXECUTE               |SYS     |DBMS_AQ
EXECUTE               |SYS     |DBMS_AQADM
EXECUTE               |SYS     |DBMS_AQELM
EXECUTE               |SYS     |DBMS_AQ_IMPORT_INTERNAL
EXECUTE               |SYS     |DBMS_DEFER_IMPORT_INTERNAL
EXECUTE               |SYS     |DBMS_REPCAT
EXECUTE               |SYS     |DBMS_RULE_EXIMP
EXECUTE               |SYS     |DBMS_SYS_ERROR
EXECUTE               |SYS     |DBMS_TRANSFORM_EXIMP
ALTER               |SYS     |INCEXP
DEBUG               |SYS     |INCEXP
DELETE               |SYS     |INCEXP
FLASHBACK          |SYS     |INCEXP
INDEX               |SYS     |INCEXP
INSERT               |SYS     |INCEXP
ON COMMIT REFRESH     |SYS     |INCEXP
QUERY REWRITE          |SYS     |INCEXP
REFERENCES          |SYS     |INCEXP
SELECT               |SYS     |INCEXP
UPDATE               |SYS     |INCEXP
ALTER               |SYS     |INCFIL
DEBUG               |SYS     |INCFIL
DELETE               |SYS     |INCFIL
FLASHBACK          |SYS     |INCFIL
Which privilege/role permits the second user to create a MOLAP cube?
Regards,
Rui Torres

Unable to generate Power View report out of Multidimensional report data source

Hi,
I have created 'Report Data Source' connection to point to Multidimensional cube on Share Point site. But when I try to create a new Power View report out of it, I get following error message :
"An error occured while loading the model for the item or data source 'http://*********/PowerPivot Gallery/TestCube.rsds'. Verify that the connection information is correct and that you have permission to access the data source."
I can see following message in the <moreInformation> section :
<Source>Microsoft SQL Server 2012 Analysis Services</Source><Message>Errors in the metadata manager. The current model can only be expressed when the client is requesting tabular view metadata with VERSION restriction of 2.0 or later.</Message>
Following are the System configurations :
1) SSAS : SQL Server 2012 + SP2 (version 11.0.5058)
2) Share Point 2013
As mentioned in one of the MSDN documents this configuration supports creation of Power View reports on multidimensional cube.
Can any one suggest what might be the issue?
Thanks in advance!

Hi Dipti,
According to your description, you get the connection failure when creating a power view report, and it throws information "Errors in the metadata manager. The current model can only be expressed when the client is requesting tabular view metadata with
VERSION restriction of 2.0 or later." Right?
Based on the error message, the issue should be the SSRS on sharepoint metadata version mismatch when sending to SSAS. There's someone mentioned in a similar thread that this issue can be solved by installing the full package of CU4 for SP1.
https://social.msdn.microsoft.com/Forums/sqlserver/en-US/133558cd-ffc8-4608-ae45-fdff01770c6d/powerview-sql-2012-sp1-cu4-cannot-connect-to-dimensional-metadata-version-11?forum=sqlreportingservices
Even you already have SP2 installed, it supposed included CU1~CU9 for SP1. However, it has reported that SP2 doesn't fix all bugs which supposed to be fixed in CU for SP1.
SQL Server 2012 Service Pack 2 is available - but there's a catch!
So please re-install the full CU4 for SP1, restart the services and try again.
Best Regards,
Simon Hou
TechNet Community Support

Cannot drop cube or analytic workspace due to ORA-37409

The error is ORA-37409: cannot delete or truncate AW used by CUBE ORGANIZED table.
This seems very closely related to the bug discussed in this thread: Drop cube organized table
We need to drop and rebuild a cube due to a design change. It looks like there are some CR$ tables related to the cube preventing the drop.
We cannot drop the CR$ table, nor can we drop the cube, nor can we drop the analytic workspace. We have tried disabling materialized view refresh on the cubes (which works but leaves the CR$ tables out there). We have tried the drop using dbms_aw.aw_delete and with dbms_cube.import_xml (to remove everything). No such luck.
Is there a workaround you can give me that will allow us to drop the CR$ tables? Or a workaround that will allow us to drop the workspace?

Update:
Our last attempt to drop the analytic workspace did remove almost all OLAP metadata. However, there were still rows in sys.olap_tab$ with object IDs relating the problem CR$ tables. In a test database, we confirmed that deleting these rows does allow us to drop the CR$ tables that cannot otherwise be dropped. However, running DML against a sys-owned table like this is unwise at best, and certainly an unsupported workaround (unless we can get Oracle's blessing to do it).
We may go through MOS and see if Oracle can provide a one-off patch for the bug listed above, to correct this situation. Or perhaps they may be able to provide some other direction.
This puts us in a situation where our only immediate option may be to uninstall the OLAP option and reinstall it.

Sap/bw cube import

hi all,
can any one help me how to import sap/bw multidimensional cube into obiee physical layer? and is there any change in work in logical layer while working with cubes?
thanks in advance.

See these articles:
[http://download.oracle.com/docs/cd/E12096_01/books/admintool/admintool_PhysicalSetup5.html#wp1021626]
[http://help.sap.com/javadocs/NW04/current/bi/docs/connectors/xmla_howto.html]
Regards.

Relational vs. multidimensional Cubes

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