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1 Reply Latest reply: May 18, 2013 6:06 PM by Nasar RSS

Cube sizing

user9134685 Newbie
Currently Being Moderated
Hi ,
Is there a OLAP cube sizing template on Exadata?
  • 1. Re: Cube sizing
    Nasar Journeyer
    Currently Being Moderated
    I doubt there is one.

    You can load and aggregate few months (or a year) of data, get the size of the cube(s), and then extrapolate from that.

    Generally it depends on:
    (1). Number of stored measures
    (2). Dimensionality of each cube
    (3). Number of Dimension members (especially parents) in each hierarchy. Cube size gets bigger with more parents or levels in a hierarchy.
    (4). How much cube data will be pre-aggregated

    Its a balance between how much data to pre-aggregate VS. what is the maximum time that will be allowed for daily/weekly cube loading.

    More hardware always help - i.e., more CPUs (depending on Parallelism), more RAM and especially faster speed disk

    On a side note:
    - Do not store, what can be calculated on-the-fly at reporting time.
    - Do not make it a dimension, if it can be an attribute

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