Number of elements at logical level / odbc driver

Hi everyone,
I'm new in BI area and I cannot understand one basic thing.
I study documentation about BI server, exactly chapter about "creating dimensions" and I'm confused about setting "number of elements at logical level"
It looks for me that "number of elements at logical level" is static.
What will be when someone update data in the table and number of elements will be different than number of elements in our logical level?
example:
current column with distinct values:
channel_desc:
direct sales
tele sales
catalog
internet
partners
in this case I set number of elements at logical level 5.
after a while some update data in the table and our column looks (see below)
column after update with distinct values:
channel_desc:
direct sales
tele sales
catalog
internet
partners
others (added value)
Does it mean that I have to change it to current numbers of elements?
I'm sure that this is misunderstanding in my case, but I don't know where?
Second problem which I have:
BI with oracle database is on linux
client software on windows
I can import data from database like sybase or flat files to the physical model, I can view data, but when I create whole model (physical, bussines model and mapping, presentation) and I try access data from "Answers" I have this error:
"Data source name not found and no default driver specified"
regards
Bart

Number of elements is just an indication used by the BI Server (e.g. when generating LOV's in Answers). It won't cause any problems when it doesn't hold the exact number of elements available in the dataset.

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What is the purpose of Number of elements at this level and ..?

Hi,
What is the purpose of Number of elements at this level an how it influences the obi server to optimize the query?
Thanks in advance.

Hello,
Number of elements at this level, specify the number of elements that exist at this logical level.By mentioning this levels we are telling to the BI Server that it is a parent and the next level is a child.
Mark if helps.

Reg Number of elements at this level and Variables

Hi Experts,
What is the purpose of Number of elements at this level in the dimensional hierarchy of BMM layer on what basis default it will show 1 if we change this value into 2 what happens .
Difference between non system session variables and dynamic repository variables in which scenarios we will use these bth variables.

Hi Rafi,
Sorry for delay response.
Nonsystem Session Variables :-
The procedure for defining nonsystem session variables is the same as for system session variables.
A common use for nonsystem session variables is setting user filters. For example, we could define a nonsystem variable called SalesRegion that would be initialized to the name of the user’s sales region.
We could then set a security filter for all members of a group that would allow them to view only data pertinent to their region.
2. difference between dynamic repository variables and non-system session variables?
Dynamic Repository Variables:-
We initialize dynamic repository variables in the same way as static variables, but the values are refreshed by data returned from queries. When defining a dynamic repository variable, we will create an initialization block or use a pre-existing one that contains a SQL query. We will also set up a schedule that the Oracle BI Server will follow to execute the query and periodically refresh the value of the variable.
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Number of Elements at this level --------------( 1 for Dimension Total)' ?

Hi All,
If we check the Dimension Hierarchy Property ..there is option like ‘Number of Elements at this level --------------( 1 for Dimension Total)’
‘Number of Elements at this level --------------( 1 for Dimension Total)’ ? in Dimension Hierarchy
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Number of Elements - What is it?

Number of elements to be defined at logical level

In the Business Model and Mapping layer, dimension >Logical Level >> number of elements at this logical level
I have come across two different version of how to deal with this
First version - From the OBE and the admin server guide it says "The number does
not have to be exact, but ratios of numbers from one logical level to another should be accurate".
Second Version - a question from asked about what defines the number at the level as best practices
To set the number of elements at each level of a dimension, which number would you use?
A. the number of columns in a logical table
B. the number of levels in a dimension
C. the number of dimensions in a business model
D. The number of tables in a physical model
E. the number of distinct rows in physical column
Question is
what is the rule to set the number of elements at this level?
If its been set depending upon the rows in the table . what will happen if the rows gets added every hour ??
Edited by: ZSAM on Jun 8, 2011 7:06 AM
Edited by: ZSAM on Jun 8, 2011 8:22 AM

The ratio between the levels is what is important I believe. BI Server will use this information to determine which aggregate source to use. You should use the number of distinct rows as the value.
You can also right click the hieracny and use "Estimate Levels" to auto-populate the numbers for you.
Paul

In OBIEE RPD hierarchy,while defining levels Number of elements count?

Whats the importance of NUMBER OF ELEMENTS AT THIS LEVEL (count) while defining the hierarchy level.Does I need to enter the MAXIMUM distinct values of any element in that dimension table.If Yes how will that value gets updated when data in DB changes.Or can I mention depending on level count too like Level 1(1),Level2(2) ...

use search functionality of the forum
Re: Estimate Levels

Number of elements - Dimensional Hierarchy

Hi,
In a *'Dimensional Hierarchy'*, while creating a new *'Parent level'*, a 'Logical Level' dialogue box prompts for entering *'Number of elements at this Level'*+. What is its significance ?
What is achieved by+ *'Number of elements at this Level'* +?+
Thanks in Advance & Regards,
Deeba

Hi deeba,
Its not mandatory to specify the number of elements in hierarchy....if you wont mention also by default it takes the value of 1.....Above vino gave you the link for explanation.
Hope it helps you...Award points and close the thread.
By,
KK

Digital I/O Voltage Logic Level Compatibility

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I see 4 options:
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2. Try a 3v to 5v converter chip, the DAQ card does run up to 800mA of current at 5V out to a pin on the connector blocks, you can power the chips off of that.(this would add delays, but at least the would be constant and minimal)
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igital one.
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Number of Elements - What is it?

Hi,
I am trying to ramp up on OBIEE, and I am going through the OBE tutorials.
In creating levels in the dimensional hierarchies, the tutorial has you specify a field called "Number of elements at this level". It doesn't really explain what it's used for, or give guidelines on what to enter for this field. Could someone please explain it a little further? I would really appreciate it!
Thanks,
Kevin

From what I know , it is number of distinct values at that level in physical table.
E.g. at region level it is
select count distinct region from physical table.
Not sure how this information is exactly used by BI server. The number does not have to exact but the ratio has to be approximate.

Odbc driver for DG-UX TRU 64 -please HELP

can anyone tell me where to find one that will anable unix process to talk to oracle db?,
also since i telent to access the DB from a pc(win 95 do i need to instal for both for client i.e win 95 and also for the server (DG-UX)or would just server be fine?
Thanking you
alka

I suspect this is going to be a rather tall order. Oracle's ODBC driver is a Windows-only product, so your PC would be able to connect to the database easily. I have heard of Solaris ODBC drivers, but I'm not sure who produces them (possible Merant). I've never heard of a company releasing DG-UX ODBC drivers.
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No of elements in a logical level.

Hi
I am very much confused with the following one. How do we know that there should be some "n" number of elements in one logical level?
"No of elements at this level......." ?
Thanks&Regards
Suresh.

Hi Kishore
thank you very much for your answer. I was searching this on google for the past one month and all searches went in vain.
But your answer is extremely valuable.
Thank you very much and keep it up.
Thanks&Regards
Suresh.

How to configure Level Number of Elements in Dimensional Hierarchies?

http://gerardnico.com/wiki/dat/obiee/bi_server/design/dimension/level_number_dimension
Above mentioned link mentions the value to be placed in Level Number of Elements in Dim Hierarchies.But being New to Obiee I am unable to understand.I would appreciate if So one explains in detail.Example would be better.
Thanks in advance for the cooperation.
Edited by: user8655160 on Jul 23, 2009 11:46 AM

Query optimization is based on the order of the tables in the FROM clause of the generated SQL. Tables with many rows appear before tables with fewer rows. This order can be important especially for RDBMS that lack an optimizer feature.
It's no more the case with the actual databases.
Example for Oracle : Query optimizer
http://gerardnico.com/wiki/database/oracle/query_optimizer/start
By modifying the number of element, you can change their order in the FROM clause but I never test it.
Cheers
Nico

ODBC Level 3 driver

Is there a ODBC level 3(or higher) driver for a winnt client connecting to a Oracle server version 7.3.4?

You should have no problem connecting an Oracle8 client machine to an Oracle7 database. It's still not clear to me whether your client machine must be running Oracle 7, like the database, or whether it can be running an Oracle 8 client.
If you must run Oracle 7 on the client, you won't be able to use an Oracle ODBC driver. Merant makes an ODBC driver for Oracle-- their Oracle 7 driver may be ODBC level 3.
For the record, future ODBC-specific questions should probably be addressed to the ODBC forum here on OTN.
Justin Cave
ODBC Development

IBM Client Access ODBC Driver DB2/400 SQL7017 Unable to run statement with specified commit level #-7017

Changed IBM As/400 system from V4R5 to V5R2 and now get this message when using Access to link to external database the same exact settings on everything I can determine on all computers.
IBM Client Access ODBC Driver DB2/400 SQL7017 Unable to run statement with specified commit level #-7017
I have Commit immediate = *NONE in the Advanced Server Options in ODBC Data Source Administrator. It shows the AS/400 files in the Link Tables list and allows me to add it to the Access table objects, but when I try to open it in datasheet view I get that
error.
What am I missing?

Ouch. That's a lot of paste...
INFO: PATH = C:\oracle\product\10.2.0\client_2;C:\oracle\product\10.2.0
\client_1;T:\SDCHS20N440\Oracle\agent10g\jlib;T:\SDCHS20N440
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If Logical level mappings are blank in an LTS , what does it mean?

Hi All,
I was trying to find this out in the forum but couldn't.
In my LTS, on the content tab, if i don't specify any "Aggregation, group by" information for the dims associated with my Fact table and keep it blank, then what does it mean? Would OBIEE treat this as at the detail level by default? So to test this, I created a logical fact and for its LTS, i didn't associate any logical level for dimensions. The query didn't give me any error and worked fine by using the correct join details.
Also when do we associate an LTS with the Total Level for a dim, what's the use because as I understand, this means all our measures from that LTS would be calculated for the total level of the dim and we can do this by creating level based measure and associating it with the total level of the dim.
I'll be thankful if somebody could explain me this in detail or direct me to a relevant documentation/ blog
Thanks,
Ronny

Hi,
When you have only one logical Table Source(LTS).
You don't specify the logical levels. By default it would consider the detail level of the logical levels mapped to the fact table.
When you have Multiple logical Table Source(LTS).
The concept of Multiple LTS comes into picture when you have multiple sources. The BI server picks the optimum logical source depending upon the fields (columns) selected. And also depends on the Number of element set while creating the dimension hierarchies. Refer-http://gerardnico.com/wiki/dat/obiee/level_number_element
For example- Suppose you have two logical table source Fact 1 and Fact 2 and logical levels( dimension hierarchies are created for two dimensions Dim 1 and Dim 2).
For the first Fact 1 source logical level is mapped only with Dim 1 and Fact 2 is mapped to Dim 2.
(You need to decide which fact source to hit depending upon the dimensions used in the report.)
Then in the report when you select Dim 1 (by means of column selector/filters) then Fact 1 source will be hit and same appears in the query.
Then in the report when you select Dim 2 (by means of column selector/filters) then Fact 2 source will be hit and same appears in the query.
One more situation where you have mapped Fact 1 with Dim 1 First level of aggregation and Fact 2 with Dim 1 with Detailed level. Then the BI server picks depending upon the user's request. If the request data can be pulled from the detailed level ( which tends to be optimum then picks from the second source).
So, its always better to set the logical source and check the query, if its hitting the correct sources according to the requirements.
Regards,
MuRam

Number of elements at logical level / odbc driver

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