OLAP 11g CUBE_BUILD_LOG

Hi to all.
In 11g when you load a cube, logging is written in CUBE_BUILD_LOG table. I don't see there any information about the number of rows loaded during a build. Is there any other place that I can find such information?
I need the number of rows just to be sure that all rows from the fact table were loaded in the cube.
Thank you very much.
Chris

Thank you Anne and Stuart.
Stuart yes it would be very helpful to have an example. I'm investigating a specific performance problem and it would be helpful to see actual number of rows that were loaded.
The problem is that although I partition on QUARTER on a time dim, when I load the last month of 1st quarter I have a SOLVE time of 31m (quarter rows including last month=1.5m). When I load the last month of 2nd quarter, the SOLVE time gets up to 57m (almost double with again 1.5m rows for the 2nd quarter). As I beleive, the SOLVE time for each quarter should be identical provided that the rows loaded for each quarter are identical (I use precompute 0% on top and 20% on button). LOAD times are identical for all months.
Anyway, when I conclude the tests I will open a separate thread for this, to be consistent with the subject.
Thank you very much.
Chris.

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Export OLAP 11G AW/Cubes to OBIEE 11g

Hi Experts,
If anyone has handled this assignment of exporting OLAP 11G AW/Cubes to OBIEE 11g, Please share all details. Currently we use BO for reporting requirements and before going ahead with OBIEE 11g would like to make sure there is not much of a gap. As of now we see a lot of incompatibility while exporting like some dims and cubes cannot be exported and so on. Any white paper/docs/information on this from experienced folks are welcome.
We are on 11.2.0.3 db release.
Thanks in advance,
MS

Here is some basic information about importing 11g analytic workspace cube and dimension metadata into OBIEE.
There are two basic options as I suspect you already know:
Option 1) Before the release of OBIEE 11.1.1.5 (I believe), there was no native support for the OLAP option within the administrator tool of OBIEE, and
one needed to use the AwM plug-in to OBIEE. The AwM plug-in generates a UDML file which can be imported into OBIEE using the OBIEE admin tool.
The AwM plug-in to OBIEE generates metadata for the source, business model, and presentation layers. The very latest version of the AwM plug-in will specially
handle calculated measures created in AwM and create the proper calculcated measure expression in OBIEE. This is very important if you are querying above the cube
to get the correct aggregation results. One area that has limited support is if a dimension only has value-based hierarchies. The plug-in will create a very simple level-based
hierarchy to at least allow the dimension to be successfully created. You then need to do more work within the OBIEE administration tool to create the fully baked
value-based hierarchies. I do not have any real-world experience with value-based hierarchies in OBIEE. Again, the AwM plug-in to OBIEE works with level-based hierarchies
and supports multiple hierarchies per dimension. The AwM plug-in to OBIEE is available on the OTN download page for the OLAP option.
Here is the link: Oracle OLAP Downloads: Software & Samples
Option 2) OBIEE 11.1.1.5 and later allows for native integration for accepting OLAP 11g dimension and cube metadata as a supported source.
This integration makes the AwM plug-in somewhat obsolete (except for the calculated measure expression integration which is unique to the AwM plug-in and using
AwM to create calculated measures including time-based calculated measures)
Please expand on the incompatibility issues you are running into. Is this related to a lot of value-based hierarchies or other issues?

Are there any Oracle OLAP ODI Knowledge Modules for Oracle Olap 11g ?

Hi guys, wasnt sure where to post this so I put it here and the ODI forum
Does anybody know when Oracle OLAP Knowledge Modules, will be available for Oracle Olap 11g. It appears that the knowledge modules released with Oracle Data Integrator 10.1.3.5, currently only work with Oracle Olap 10g...
If there is no timeline, does anybody know of work around to get ODI reverses working on Analytical Workspaces built in Oracle Olap 11g
Thank you
Richard
Edited by: RichardSmith on May 15, 2009 11:51 AM

Raise a service request with Oracle Support (Metalink) for your system slow issue. May be, they will recommend you the workarounds for the issues which are not yet available for 11g in the form of Patches.
Regards,
Sabdar Syed.

OLAP 11g BUILD CLEAR example

Can anyone please help me find the syntax/plsql block of clearing dimension data from cube in OLAP 11g?
Thanks

BEGIN
DBMS_CUBE.BUILD('OLAPTRAIN.CHANNEL USING (CLEAR)');
END;
Note that when you clear a dimension, you also clear data from every cube that is dimensioned by that dimension.

How do I know what is the minimum resource requirement for OLAP 11g?

How do I know for OLAP 11gR1 ...
1. what is the minimum number of CPUs and speed required
2. how much minimum physical memory, SGA, PGA etc. is required?
Regards, Anirban

Hello Anirban,
In summary, since the OLAP option is an option to Oracle Database 11g, Enterprise Edition the minimum requirements in order to run the database would be identical to those necessary to run a "Data Warehousing" type installation. That being said starting up a database is a far cry from actually performing well while accessing and building OLAP Cubes in your Database.
There are lots of things to consider. For example: the complexity of your model; data sparcity; level of aggregation; system load, SLAs, etc..
Lets look at true minimum requirements and then consider what it would take to achieve good performance in your environment
TRUE MINIMUM...
I performed a test in my environment (Oracle Database 11g Release 2 (11.2.0.2.0) on Oracle Enterprise Linux 5.5) using Analytic Workspace Manager 11.2.0.2.0A and found the following minimum settings to work against the OLAPTRAIN schema (You may find it here http://www.oracle.com/technetwork/database/options/olap/index.html). This is a very small schema which we use for demonstration purposes.
I discovered that the database started with a memory_target of only 160m (apparently this is the absolute minimum for my environment). I knew that if the database successfully started that I would be able to query the Cube but maintain it? Running queries against the OLAPTRAIN Sales Cube, despite being slow, worked as anticipated. Next, I performed a maintain operation on the Sales Cube where I had to abort the job because it ran into memory issues at 160m, however, when I increased it to only 180m it did a complete maintain in a reasonable timeframe, albeit slow considering the limited resources.
MINIMUM REQUIREMENTS TO ENSURE REASONABLE PERFORMANCE IN YOUR ENVIRONMENT
Most importantly ensure you have a good cube design
Run a sample set of your data in order to define what "reasonable performance" is for your environment. Create a small representative cube in order to test both build and query performance while collecting and analyzing database statistics through AWR and ADDM. For OLAP option specific queries please take a look at http://wiki.oracle.com/page/OLAP+option+-DBASample+Scripts.
You could creat a view on top of your fact table and use the view to generate your OLAP Cube. This will allow you to test a more manageable amount of data. For example, if you have 10 years of data and want to determine the footprint and resources required in order to manage a Cube of this volume then consider scoping it down to a few months first then increase it by a measured amount in order to predict requirements. Monitor your resources and ensure you balance I/O, memory and processors. Since the OLAP option is a Enterprise Edition option it falls under Data Warehousing. As such there is plenty of literature available on oracle.com in order to define what it takes to achieve a balanced Data Warehouse.
I would recommend contacting Oracle Consulting or an Oracle Partner to determine the best fit for your environment.

Accessing OLAP 11g Cubes

Hi Experts,
We are on OLAP 11.2.0.1 and have built cubes using AWM 11g. What are the different and best ways to provide access to these OLAP cubes for reporting. We are looking at Simba MDX provder. Any idea if XML Publisher can be used to provide access to these cubes? If so, Can you please let me know from where can i get any information/documentation related to this? We would ideally want to study the pros and cons b/w the various ways of access 11g OLAP cubes.
Look forward to suitable replies.Thanks in advance.

You can refer to this page here => http://www.oracle.com/technetwork/database/options/olap/index.html
You also have APEX to query the olap cubes other than excel addin from simba and OBIEE.
Thanks,
Brijesh

OLAP 11g - Passing external Paramteres into AW

We are on OLAP 11gR2 release
I have a scenario where in I need to pass Period dimension chosen by the USERS while they run queries ( via Cube ET views from BO application) against OLAP Cube. Since this is dynamic scenario, is there a way to do it via DML program?? Our ACCOUNT dimension has attributes BEGIN date and END date. QTD and YTD needs to be calculated based on the period parameter being passed, if it is outside the this date range the no else yes.
PERIOD dimension member would be something like 201112 for Dec2012 which i think needs to be converted to proper date format.
HAs this been done before? Any help would be much appreciated.
Thanks.

Assume you're using sql to access aw, then BO parameters you need to pass would become oracle olap aw sql query where clause filters.
I dont think you're constructing the report/solution correctly by thinking in terms of passing parameters.
So instead of "passing parameters", think "framing/constructing the right sql".
What you need to do is define YTD, QTD appropriately in AW. They can be defined for all periods based on the time dimension in your model.
However you need to use the control parameter within the calling application/program: if account dimension attribute values meet the period specification criteria then call/reference YTD/MTD measures else use null instead.
YTD, MTD being defined as a calculated measure does not imply that the fromulae are pre-calculated and stored for all periods. It's only the measure definition which is stored and this defn results in the right calculation for MTD/YTD. No harm/work is done just because they're defined. Based on the scope/dimension members involved in the call to the cube/aw referencing these formulae/measures, these calculations are fired/triggered and the results calculated for the cells in question.
If you frame the right question (i.e. right sql from BO), you'll get the right answer/results from oracle olap quickly.
HTH
Shankar

Error while maintaing olap 11g cube

Hi,
Iam getting the below error while trying to maintain the cube
An error has occurred on the server
Error class: Express Failure
Server error descriptions:
INI: Error creating a definition manager, Generic at TxsOqConnection::generic<BuildProcess>
INI: XOQ-01724: Can not specify a USING clause with a rewrite MV cube, Generic at TxsOqBuildProcessor::initializeForDimension
at oracle.olapi.data.source.DataProvider.callGeneric(Unknown Source)
at oracle.olapi.data.source.DataProvider.callGeneric(Unknown Source)
at oracle.olapi.data.source.DataProvider.executeBuild(Unknown Source)
at oracle.olap.awm.wizard.awbuild.UBuildWizardHelper$1.construct(Unknown Source)
at oracle.olap.awm.ui.SwingWorker$2.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
ALso when I try to drop the cube/dimension , I get the following error
An error has occurred on the server
Error class: Express Failure
Server error descriptions:
DPR: Unable to create server cursor, Generic at TxsOqDefinitionManager::generic<CommitRoot>
INI: XOQ-00703: Error executing OLAP DML command "(AW ATTACH CBU_UNIFIED.RECHARGES RW : ORA-34738: A severe problem has been detected. Analytic workspace operations have been disabled.
)", Generic at TxsOqAWManager::executeCommand

The two errors are, I suspect, unrelated.
The XOQ-01724 error happens if you attempt to execute dbms_cube with a script that contains a USING clause. This is allowed for most cubes, but not for cubes associated with a materialized view. If this is what you tried to do, then the error is expected and the solution is to not specify a USING clause or to drop the MV.
The second error is much more serious since it means your AW is probably corrupted. Did this happen after a failed parallel build? What version are you using.

Building OLAP 11g Cubes Tutorial

I followed the tutorial [http://www.oracle.com/technetwork/database/options/olap/buildicubes-090657.html#o]
all the way to the section of Mapping cubes to relational sources and I got stuck. Since the images / diagrams do not come up I was unable to figure it out, can somebody assist me on this matter. Maybe there is a way to be able to view the images / diagrams. I am very new to this cubes and so far I find it very interesting, but I still want to understand fully the advantages of using cubes in reporting in OBIEE.
http://www.oracle.com/technetwork/database/options/olap/buildicubes-090657.html#o
Thanks

Not sure why the images are not showing up on this website. Maybe someone from development can get it fixed.
Regarding benefits of using OLAP cubes with OBIEE, see recent posts:
HOLAP - using OBIEE and Oracle OLAP
and
Usage of OLAP
There are lot of benefits. It simplifies reporting, as the calculations and aggregations are "pushed" inside the database (i.e., OLAP cubes).
No need to create MVs or aggregate tables.
Adhoc Query performance is excellent, no matter what level of data you are looking at.
Calculations are very easy to create, and automatically works at all levels of all dimensions.
OBIEE rpd work is extremely simple, and very minimal - compared to obiee reporting from relational sources.

Oracle 10g OLAP to 11g OLAP upgrade ?

We currently are planning on a upgrade from 10g OLAP => 11g OLAP. We currently have 12 AWM's in 10g OLAP which we need to move over with associated DML programs and additional SQL reporting views.
Questions:
1. Is there any documentation available on necessary steps for 10g OLAP => 11g OLAP upgrade?
2. What would happen to existing AWM's prepared in 10g, would they be migrated to 11g transparently or have to be re-created?
3. Is there any specific documentation related to changes in way cube builds are done programatically?
4. Any changes in the way limit maps work in 11g?
Please advise.
Thanks,
Sudip

Migrating a 10g cube to 11g depends on whether you are talking about 11gR1 or 11gR2. 10g cubes continue to operate in the "10g way" even after a database upgrade. They will not become "11g cubes" until they are rebuilt after the database upgrade. In 11gR2, there is a supported way to migrate 10g cubes to 11g cubes, both with AWM and with PL/SQL. Sorry to say... this functionality doesn't exist in 11gR1: you'll have to rebuild your cubes from the ground up.
The SQL relational views built using the AWM plugin in 10g are no longer applicable in 11g. That's because OLAP cubes in 11g are registered in the oracle data dictionary (just like other Oracle objects), and the SQL relational views are managed in the database and a recognized part of the product. The SQL relational views are quite different in 11g, so you will likely have to rewrite queries against them.
LIMIT map syntax is the same, but performance is much better.
See if this blog entry helps:
http://www.rittmanmead.com/2009/10/09/olap-10gr2-and-dense-looping/
Edited by: Stewart Bryson on Feb 19, 2010 8:40 AM

11g OLAP cube MV's with Query Rewrite option

Hi All,
I am trying to test the 11g OLAP cube MV's with the Query Rewrite option.
I had created a cube on the schema OLAPTRAIN problem by oracle. I an selected necessary options in 'Materialized Views' tab of the Cube definition in AWM. here is the screenshot
!http://i40.tinypic.com/9jzpte.png!
and then I try to run the SQL query
select SUM(S.QUANTITY) AS QUAN,
SUM(S.SALES) AS SALES,
T.CALENDAR_YEAR_NAME,
P.DEPARTMENT_NAME,
C.COUNTRY_NAME
FROM
TIMES T,CUSTOMERS C,PRODUCTS P, SALES_FACT S
WHERE
C.CUSTOMER_KEY = S.CUSTOMER AND
T.DAY_KEY = S.DAY_KEY AND
P.ITEM_KEY = S.PRODUCT
group by T.CALENDAR_YEAR_NAME, P.DEPARTMENT_NAME, C.COUNTRY_NAME;
and observed the Explain plan, it is not using OLAP cube built, instead it is using the relational tables given in the above sql query.
Also, i have observed that , though enabling or disabling of the Query Rewrite option doesn't make any change in the Explain query for the above query.
alter materialized view olaptrain.cb$sales_cube enable query rewrite;
alter materialized view OLAPTRAIN.cb$sales_cube disable query rewrite;
No idea why is this Query Rewrite feature is not working on my Database instance of 11g R2 . Do am I missing any steps that has be taken care of , to make this working. Any inputs would be appreciated.
Thanks
S

Hi there,
You should check out Note 577293.1 on Metalink - 'Oracle OLAP 11g: How to ensure use of Cube Materialized Views/Query Rewrite'
Thanks,
Stuart Bunby
OLAP Blog: http://oracleOLAP.blogspot.com
OLAP Wiki: http://wiki.oracle.com/page/Oracle+OLAP+Option
OLAP on OTN: http://www.oracle.com/technology/products/bi/olap/index.html
DW on OTN : http://www.oracle.com/technology/products/bi/db/11g/index.html

XOQ-01600: OLAP DML error while executing DML "SYS.AWXML!R11_LOAD_DIM"

hi all,
I am trying to do the tutorial Building OLAP 11g Cubes (http://st-curriculum.oracle.com/obe/db/11g/r1/olap/cube/buildicubes.htm), but when I try to "Maintain Cube SALES_CUBE" I get the following error:
An error has occurred on the server
Error class: Express Failure
Server error descriptions:
INI: error creating a definition manager, Generic at TxsOqConnection::generic<BuildProcess>
INI: ORA-35571: The maximum number of load errors has occurred. No changes from this step were committed to the database.
XOQ-01600: OLAP DML error while executing DML "SYS.AWXML!R11_LOAD_DIM", Generic at TxsOqStdFormCommand::execute
INI: XOQ-01601: error while loading data for Cube Dimension "OLAPTRAIN.PRODUCT" into the analytic workspace, Generic at TxsOqStdFormCommand::callR11LoadDim
at oracle.olapi.data.source.DataProvider.callGeneric(Unknown Source)
at oracle.olapi.data.source.DataProvider.callGeneric(Unknown Source)
at oracle.olapi.data.source.DataProvider.executeBuild(Unknown Source)
at oracle.olap.awm.wizard.awbuild.UBuildWizardHelper$2.construct(Unknown Source)
at oracle.olap.awm.ui.SwingWorker$2.run(Unknown Source)
at java.lang.Thread.run(Thread.java:662)
Can anyone help me?
Thanks,
Carlos

I have seen this (in 11.1.0.7, I believe) when the metadata cache ("kgl") gets out of synch with the data dictionary. Specifically there is a flag that determines if prefixes get added to dimension members ("use surrogates" in AWM terms) that becomes false instead of true. If you look at the generated SQL in the OUTPUT column of the CUBE_BUILD_LOG you may find that sometimes a prefix is added to dimension members (e.g. "LEAF_LEVEL_" || dim_table.leaf_column) and othertimes it is not (e.g. just dim_table.leaf_column). A workaround if this is the case may be to execute the following (as dba) before building the dimension.
alter system flush shared_pool;

Preaggregation across value based hierarchy dimension in 11g

Hi All,
I have created a cube with 6 dimensions in olap 11g. One of those six dimensions has only one hierarchy which is value based hierarchy. I have chosen level based aggregation as I know at what levels exactly users are going to query. When I was going through the dimensions to choose levels to preaggregate I noticed there were no options available for my value based hierarchy dimension ( I could see "all" option for the same case in 10g) then I tried to look for definitions of underlying objects just to make sure it will preaggregate data across my value based hierarchy dimension.
I found value set corresponding to my value based hierarchy dimension in <CUBE NAME>SOLVEAGGMAP object , which AWM uses to decide which dimension values to preaggregate but if I do rpr on that value set (rp r<CUBE NAME>SOLVE<DIMENSION NAME>_PVSET) it shows NA so my question is can I pre aggregate across value based hierarchy dimension in olap 11g?
Olap Version: 11.2.0.1
AWM version: 11.2.0.1
Thanks

Even if you know exactly which levels your users will query, percent based precompute (e.g. 30%) may still be faster in practice because queries are returned using 'sparse looping' instead of 'dense looping'. This was the single biggest performance advantage of 11g over 10g.
But if you still want to use level based precompute, then you should look at the XML template for the cube (as saved by AWM, for example). In it you should find something called PrecomputeCondition. This defines the set of members that are precomputed. Here is an example I just created using the GLOBAL schema
<PrecomputeCondition>
<![CDATA[
"TIME" LEVELS ("TIME"."MONTH", "TIME".CALENDAR_QUARTER, "TIME".CALENDAR_YEAR),
CHANNEL LEVELS (CHANNEL.TOTAL_CHANNEL, CHANNEL.CHANNEL),
CUSTOMER LEVELS (CUSTOMER.MARKET_SEGMENT, CUSTOMER.REGION, CUSTOMER.SHIP_TO),
PRODUCT LEVELS (PRODUCT.CLASS, PRODUCT.FAMILY, PRODUCT.ITEM)]]>
</PrecomputeCondition>The PrecomputeCondition is also visible through the USER_CUBES view.
SELECT PRECOMPUTE_CONDITION
FROM USER_CUBES
WHERE CUBE_NAME = 'MY_CUBE';You can hand modify this condition in the XML to specify an alternative 'non level based' precompute condition for any dimension. For example, if you define an attribute named 'SHOULD_PRECOMPUTE' on your PRODUCT dimension that is 1 for members to be precomputed and 0 for all others, then you can change the condition as follows.
<PrecomputeCondition>
<![CDATA[
"TIME" LEVELS ("TIME"."MONTH", "TIME".CALENDAR_QUARTER, "TIME".CALENDAR_YEAR),
CHANNEL LEVELS (CHANNEL.TOTAL_CHANNEL, CHANNEL.CHANNEL),
CUSTOMER LEVELS (CUSTOMER.MARKET_SEGMENT, CUSTOMER.REGION, CUSTOMER.SHIP_TO),
PRODUCT WHERE PRODUCT.SHOULD_PRECOMPUTE = 1]]>
</PrecomputeCondition>If you recreate the cube from the XML with this condition, then the PVSET valueset you discovered should contain all dimension members for which the attribute value is 1.   This gives you complete control over what is precomputed.   Note that AWM doesn't support this form of condition, so it won't show up if you go to the Precompute tab, but it is valid for the server. The PL/SQL below will modify the PrecomputeCondition (for the cube named MYCUBE) without going through AWM.
begin
dbms_cube.import_xml(q'!
<Metadata
Version="1.3"
MinimumDatabaseVersion="11.2.0.2">
<Cube Name="MY_CUBE">
    <Organization>
      <AWCubeOrganization>
        <PrecomputeCondition>
          <![CDATA[
           "TIME" LEVELS ("TIME"."MONTH","TIME".CALENDAR_QUARTER, "TIME".CALENDAR_YEAR),
           CHANNEL LEVELS (CHANNEL.TOTAL_CHANNEL,CHANNEL.CHANNEL),
           CUSTOMER LEVELS (CUSTOMER.MARKET_SEGMENT,CUSTOMER.REGION,CUSTOMER.SHIP_TO),
           PRODUCT WHERE PRODUCT.SHOULD_PRECOMPUTE = 1]]>
        </PrecomputeCondition>
      </AWCubeOrganization>
    </Organization>
</Cube>
</Metadata>
end;
/

OLAP Reporting Tool

Hi all,
Recently we get account with New client in reporting front and the domain is Telecom.
Could any one suggest which OLAP tool i can choose to work on other than Discoverer.
Regards,
Sreedhar

Any tool that can generate SQL can act as a reporting tool for Oracle OLAP
For more information, take a look at the following links:
http://www.oracle.com/technology/products/bi/olap/pdf/olap-11g-datasheet.pdf
http://www.oracle.com/technology/products/bi/olap/Oracle_OLAP_11g_TWP.pdf

Help with OBIEE reports on Oracle 11g Cube

Hi,
We have created a 4-Dimensional Oracle 11g cube using AWM 11g and have integrated that with the OBIEE repository using the Dimension Hierarchy views as created by AWM.
Now, when we create a “table” type of report with this cube in OBIEE Answers, all goes fine – we can see all the expected data in the report. However, if we create a “pivot table” type of report using the same selection (query) criteria as in the “table” type of report, then all the cells corresponding to the measure columns show up as blank (empty) – no data is populated in the measure cells. This happens regardless of the positioning of the 4 dimensions in the pivot table - columns, sections, and pages.
Are we missing something in the repository/report setup here? Any help is much appreciated.
Thanks and Regards,
Piyush
Our Environment:
Oracle Database 11g Enterprise Edition Release 11.1.0.6.0 - 64bit Production
With the Partitioning, OLAP, Data Mining and Real Application Testing options
AWM v11.1.0.6.0A
Cube Type: OLAP 11g
Oracle Business Intelligence Enterprise Edition 10.1.3.3.2
Any help on this thread is much appreciated.
Thanks,
Piyush
Message was edited by:
P_S

Hi Marcus,
I have now been able to resolve this issue. Here's a summary of what happened in my case:
Cause of Problem –
The default aggregation method for the measures is set to "None" in the OBIEE repository.
Resolution -
In OBIEE answers pivot table report, click on the "More Options..." icon next to the measure name in the measures column. Then select "Aggregation Rule > Sum" and this should do the trick !!
(Please note that in the as-is situation, you will see that the Aggregation Rule is set to Default - you have to change this to SUM).
This is how it worked for me.
Hope this helps. Please do let me know how you get on with this.
Best Regards,
Piyush

OLAP 11g CUBE_BUILD_LOG

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