Populating the time dimension in ODI

I need to populate my time dimension in ODI> I read a solution in this forum suggesting to create a time table/view in the source schema, reverse it in ODI and then use it as source to populate the time dimension. Is there another way to do this? One way I thought of was to use the ORDERDATE field in my ORDER table (my source table in Oracle) and map it to my time dimension in SQL Server via an interface. But I also have DUEDATE, SHIPDATE and PAYDATE fields in my ORDERS table and this approach would mean that I have to map them through separate interfaces to the time dimension as well. I have created a procedure in the source schema(Oracle) and want to use it in ODI to populate the time dimension. But I amnt sure if that is possible in ODI. Could anyone help me with this please?
Regards,
Neel

Hi Neelab,
Sorry for my delay to reply you, I had no time the lasts days...
To get the four distinct key from your time dimension, just add four instance of dimension table at interface each one joined with one of the columns.
I believe that you load your time dimension from some other table than PRJ_TBL_TRANSACTION because you have the HolidayType column in your time dimension...
A view is one possible solution to load the time table but depends how the performance of the query is.
A way to do it at ODI is:
- Create 4 interfaces, one for each column, to load 1 singe table with 1 single date column, don't worry about duplicated value at this time, than you can just use the "IKM Control Append" that has more performance but check the "Distinct" box (flow tab) at each interface
- Create a last interface from this temp table as source, to the time dimension target table. Now you will use the "IKM Incremental Update" and do choose the "Update" option to "NO". Check the "Distinct" box.
As this table will have no more than 6.200 records from the last 20 years it will be a small table where you shouldn't have performance problems.
These are some of possible solutions but I would like to add other "way to think".
By the table that you show here you have a simple time table with no special feature, for that, let me suggest you other way.
- in the current way you will join but didn't get the record that "fail" from the join once they will be exclude if a date do not exist at time dimension
My suggestion:
- Load the dimension time table from your source table
- as PK in time dimension table, use the ''Julian Day"
- At ODI target fact table (datastore), create a 4 reference constraints (one by column) to the time dimension
- at interface do not use the dimension as source and transform the 4 date to Julian and let the 4 constraints take care if they exists or not at dimension table.
OR
- Look for the minimum "possible" date at your company
- populate your time dimension with every each day since then until a future date (Dec 31, for instance)
- create a process to populate the future date that will be execute in a interval that you decide (once a year, once a month, as you wish) dependent on how further the date is populated
- use the "Julian date" as PK
- At interface just transform any date to "Julian Date" it will be at dimension time once it is naturally unique
You could substitute the Julian date for "YYYYMMDD" that is a unique value too.
I presented you 2 way to consider be considered, each one could be used based on how important is for the business know if a date was loaded or not.
Someone can question that has the dates loaded from source against has all dates previous loaded could help to find errors from days that wasn’t loaded but it has a failure. As there are 4 dates source columns (and we are talking just about one source table until now) if a date loaded math a date when the load failure there is no value in use the time dimension date to analyze this possibility.
I defend the full time dimension load.
Make sense and/or help you??

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Reposted.

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Hi there,
This forum is for Oracle OLAP. The Essbase forum can be found here:- Essbase
Thanks,
Stuart Bunby
OLAP Blog: http://oracleOLAP.blogspot.com
OLAP Wiki: http://wiki.oracle.com/page/Oracle+OLAP+Option
OLAP on OTN: http://www.oracle.com/technology/products/bi/olap/index.html
DW on OTN : http://www.oracle.com/technology/products/bi/db/11g/index.html

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BUSINESS MODEL ERP:
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[OWB Home]\owb\misc\time\readme.txt
[OWB Home]\owb\misc\time\owb_bp_time.mdl
and
[OWB Home]\owb\misc\time\owb_time_seq.sql
[OWB Home]\owb\misc\time\owb_time.sql
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Hi,
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Ingmar,
I just read your post and I am trying to accomplish the same thing with the time dimension - can you help me or direct me to another post that can?
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LEVEL
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Magini,
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{color:#0000ff}Essbase version 7.1.6
3 dimensions
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1. shutdown and backup your database (!!!).
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Download the 'SQL_as_source' knowledge module from the Oracle ODI Blog here : http://blogs.oracle.com/warehousebuilder/entry/odi_11g_simple_flexible_powerful
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SELECT to_date('01011980','ddmmyyyy') + LEVEL - 1 DT
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/* Start Date in here -> */ to_date('01011980','ddmmyyyy')) +1 )
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'QUARTER',
NULL,
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UNION
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'MONTH',
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to_char(DT,'YYYY')from row_generator
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Hope this helps
Rgrds
Alastair
p.s - my time dimension is loading multiple levels (Years, Quarters, Months) into the same table - the SQL contains a row for each day though so easily adapted to report days.
Edited by: PeakIndicators_Alastair on Jan 24, 2012 12:05 PM

Populating the time dimension in ODI

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