Understanding Dimension creation in Oracle 9i

Hi all
I created using SQL*Plus command line (CREATE DIMENSION...) this one dimension (3 levels, 1 attribute on bottom level) based on a sample fact table.
From the fact table I retrieved 4 columns for: 3 level IDs and 1 attribute for the bottom level.
Now my questions are:
1. How can I view the dimension data content? I am not sure if this is possible as my understanding suggests that 9i only creates the metadata for a dimension and no data is contained within this object.
2. The fact table contains multiple rows having the same bottom level ID. How do I know that this data will not get replicated in the Dimension? or is it that Oracle will exclude any duplicate rows when filling in the Dimension? I know it's the latter but need confirmation anyways.
3. If and when the base fact table gets altered/modified/appended how is it possible to "re-load" the Dimension with new values? Or is it done automatically?
Please note that our current infrastructure is Oracle 9iR2 on a SOLARIS 9 platform.
Cheers.

Si, I really appreciate you taking time out and answering this query of mine.
OK, so ideally I should have an actual physical Dimension table with additional descriptive columns for each level and then subsquently map the dimension metadata definition to that table. But comparatively, from a tangible performance perspective, what am I missing out on?*
In all probability going the "physical" way I'll end up using more disk space by integrating millions of unique SCs in the dimensional table. Moreover, I'll have to "merge" most recent new-ish SCNUMBER records (daily) into the physical table first before running any query on the fact MV table, which will definitely incur some amount of time. I do agree that having more descriptive attributes for each level will only help me segment my overall analysis better but that's not important at this time.
From a solely performance perspective am I doing the right thing by just defining meta-data? What else can I do to speed up analysis on this MV?
Edited by: oracle_disciple on Jan 27, 2009 9:47 PM

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