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

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When i double click on logical level hierarchy, it has keys tab where i have two keys now.
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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?
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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.

Number of elements at logical level / odbc driver

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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"
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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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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?
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Hi Rafi,
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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.
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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.
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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

Get the number of elements in Array

Hi everyone,
Could anyone give me idea on how to get the number of elements in an Array (not number of rows) ?
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You are going to have to provide some proof that the Array Size does not work correctly. Right click on the input to it and select 'Create Indicator'. Run the VI. Go to the front panel and select 'Edit>Make Current Values Default'. Save the VI and attach it to your post.
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Message Edited by Dennis Knutson on 04-21-2009 10:40 AM

Count number of elements

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probably there is somethin wrong in how I use the xmlsequence...
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Stefano
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Sure - thanks for the time and thoughts.
I am using the schema you helped me with a bit ago, Re: unique constraint defined in xsd
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Number of elements to be defined at logical level

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