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.
Note: When the value of a dynamic repository variable changes, all cache entries associated with a business model that reference the value of that variable will be purged automatically. Each query can refresh several variables—one variable for each column in the query. We schedule these queries to be executed by the Oracle BI Server.
Hope this help's
Thanks,
Satya

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

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

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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?
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Second problem which I have:
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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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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) ...

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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

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.
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Hi all
I am using myRIO , LV14 to run my application.
Application: I have to continuously acquire data via FPGA and process in RT host once every 2000 samples are collected. I use DMA FIFO (size 8191) to acquire data, use timeout property at the FPGA to eliminate buffer overflow. I had followed cRIOdevguide to implement this part. A snippet of what I have implemented is attached. Whole code runs in SCTL at 50MHz.
Issue: Twice or thrice I encountered with this strange behaviour, that the FPGA FIFO is giving continous timeout and the RT is unable to read the FIFO. The number of elements to write propery in FPGA VI gives 0 showing that FIFO is full and no more can be written, but at the RT, elements remaining is giving 0, hence it is reading 0 (no) elements.
Workaround: I put a case where I will write to FIFO (as per the code) and if the number of elements to write is nonzero. It seems to work fine, as of now.
What confuses me is that my FPGA VI says that FIFO is full (FIFO number of elements to write = 0) and gives a timeout error, but RT VI says that number of elements remaining in FIFO is 0 and hence no data is read. Any idea why it is so? My FPGA and RT VIs continues to run, but with no data being acquired or read.
I saw this behaviour within minutes after running the code. Any idea as to why it is happening? I am trying to reproduce the behaviour and will update if i again encounter with it. Sorry, I cannot post my code here, but i guess the code snippets explain it to some extend.
Thanks
Arya
Edit: Even with the mentioned workaround, the problem persists, now that the FPGA does not write to FIFO at all. And the RT VI is not able to read any elements as it sees 0 elements in the FIFO. The FIFO continues to be in timeout state. So i guess the problem is with the RT side.
Solved!
Go to Solution.
Attachments:
cRIOdevguide_FIFOreadwrite.PNG ‏107 KB
FPGA_FIFO_write.PNG ‏41 KB
RT_FIFO_read.PNG ‏39 KB

Hi Nathan
Yes, I could have replaced it with an OR. Regarding my application, I want to acquire data in chunks of 2000 samples. If at all I receive a timeout error, I want to discard that chunk of 2k samples and start all over again. So my logic was like this, I acquire the data, if there is a timeout, the reset is triggered, and the system waits to comeback from reset, and it starts acquiring again. Btw, I tried removing the multiple FIFO reads in RT, but the error is still the same.
I have a small doubt as well, if I do not want to obtain stale data at alI, I would just check if timeout occurs, empty my FIFO and start acquiring data again (no reset button), isnt it? This was my original logic, but I saw that after a while, it stopped acquiring data and timeout led was on. I was thinking that FPGA and RT was simultaneously trying to acquire FIFO which might cause timeout. Somehow, I now feel that, as you have pointed out, my code is overly complicated. I will modify it and update the results. Thank you!
Arya

Reg Number of elements at this level and Variables

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