Update/Load Dimension table attributes(non-key elements)

Hi,
Is there a configuration change in DAC or Informatica where I can opt to load all the dimension tables during an incremental load, irrespective of an associated transaction in the fact table? I observed that for all those accounts with no corresponding transactions are extracted but dropped by the time they reach the actual dimension table. So in the final target DWH, only those unique accounts are brought which have an associated transaction.
I know we can create an aux mapping to include some kind of a flag to trick DAC into thinking the corresponding base fact table also has changed and then bring over the dimension data. But is there a simple alternative?
For example, In GL we have an account dimension which has an associated line transaction details for each account in the fact table. I just change the Account name from A to B. No change or updates to the associated line entry in the FACT table. Now I run an incremental load. Will the change ( new account name) be recognized and brought over? OR will it be brought over only when the associated line entry also changes?
Usually when the dollar amounts dont change, nobody cares but in our case the client wants it. I have googled extensively to understand incremental loading but cud not get a clear response to the above question. Does SCD2 play any role in this?
Thanks,
Dan

Ahsan,
The question primarily revolves around dimension tables and incremental load. If we take out SCD1/2 out of the scene for now, could you please answer Yes or No for the below questions? Please it is kind of urgent as the client is really worried about these aspects of data transfer in incremental loads. As always, appreciate your quick response. Assume that first full load has been done.
1. If we change a key field (effective date) of an account that does not have a new transaction associated with it in the ledger – will the change come over after an incremental load?
2. If we change a non key field (title) on a prior effective date of an account that does not have a new transaction associated with it in the ledger – will the change come over after an incremental load?
3. If we change a non key field (title) on a prior effective date of an account that does have a new transaction associated with it in the ledger – will it reflect after an incremental load?
4. During a load process Full/Incremental, dimension tables get loaded first right? IF not, and facts are loaded first, wont they error out seeing that no associated dimension details exist?
5. We have a few custom tables which dont have any sort of a datetimestamp columns. Is bringing them all over everytime load happens, the only option? What is the best method to handle these kind of situations?
Thanks,
Dan

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Best Practice loading Dimension Table with Surrogate Keys for Levels

Hi Experts,
how would you load an Oracle dimension table with a hierarchy of at least 5 levels with surrogate keys in each level and a unique dimension key for the dimension table.
With OWB it is an integrated feature to use surrogate keys in every level of a hierarchy. You don't have to care about
the parent child relation. The load process of the mapping generates the right keys and cares about the relation between the parent and child inside the dimension key.
I tried to use one interface per Level and created a surrogate key with a native Oracle sequence.
After that I put all the interfaces in to one big Interface with a union data set per level and added look ups for the right parent child relation.
I think it is a bit too complicated making the interface like that.
I will be more than happy for any suggestions? Thank you in advance!
negib
Edited by: nmarhoul on Jun 14, 2012 2:26 AM

Hi,
I do like the level keys feature of OWB - It makes aggregate tables very easy to implement if your sticking with a star schema.
Sadly there is nothing off the shelf with the built in knowledge modules with ODI , It doesnt support creating dimension objects in the database by default but there is nothing stopping you coding up your own knowledge module (use flex fields maybe on the datastore to tag column attributes as needed)
Your approach is what I would have done, possibly use a view (if you dont mind having it external to ODI) to make the interface simpler.

Ssis to load dimension table

i want to be able to generate a dimension out of fact table
the attribute is the name of a store which can be spelt anyway.
but in the dimension table, i want all the member values with similar spelling to correspond to a single store and mapped to a unique key.
how is this one using ssis
the fact table may have the followng for walmart
walmart
walmartab
walmart123
how to map all these walmarts to a single walmart and also associate a unique key
the dimension table should have
ID storename displayname
1 walmart    walmart123
2 walmart   walmart
3 walmart   walmartab
OR, would it be a better idea to clean the source and then have a dimension like below?
1 walmart
please advice wahat is the general best practice for designing as well as loading the dimension table
thanks very much

do you mean, the fact table needs to be cleansed? or can it be left alone with diffent values within the fact tablebeing mapped to a single value, which requires cleaning the dimension?
which is the preferred approach and why?
if the dimension is cleaned this would be the resulting dimension
ID storename displayname
1 walmart    walmart123
2 walmart   walmart
3 walmart   walmartab
OR, would it be a better idea to clean the source and then have a dimension like below?
1 walmart
Its dimension that needs cleansing. The fact will only have fk to dimension using key value isnt it? So you need to make sure you complete the cleansing in the dimension and based on which you map the key values correctly in fact to correspond to survived key
value for collapsed values
Please Mark This As Answer if it helps to solve the issue Visakh ---------------------------- http://visakhm.blogspot.com/ https://www.facebook.com/VmBlogs

Dimension table, indexing business key

Hi.
I my dimension table business key is Unique key constraint and business key is also a index key (unique).
My question is why is important for dimension to have index?
In my mapping I first load data into dimension and to merge data I use business key. Ok, business key is unique so I'm merging by constraint (UK).
I have a fact table mapping where I use previous dimension for lookup, and I do lookup by a business key.
I understand why we have index in fact tables, but in dimension?
When and why does business key index help me?

Hi,
There are many reasons why we use indexex on dimensions.
1) The source key or natural key may or may not be a unique one in case of SCD2 and hence its faster to look up w.r.t the index key rather than the source key.
2) It is not a good idea to have all the source keys from ur dimensions in ur fact. We have to have the index keys anyway to speed up the process of quering.
3) The index key is always unique and so u will always land on only 1 record on any look up
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Bharath

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Hi All,
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Can we update oracle standard table Attributes column by custom trigger?

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Dimension Table Attributes giving No Fact Table Exists Error

Hi Experts,
My OBIEE version is 11.1.1.6.10. There is a presentation table which has columns coming from multiple logical tables. I'm dragging 2 columns into the report which are coming from 2 logical tables.
The result is displaying. When I checked the query, a fact table is also coming and results are getting effected because of this.
Could anybody let me know if any idea.

Hi SriramKarthik,
Aj (bi007) already gave you the answer on how you can change the implicit fact table, the one you are seeing in your physical query.
I'm just not sure of what is your question: are you surprised to see a fact table is used in the physical SQL and look for a way to avoid it because, as you say, results are impacted by that implicit fact table? You can't get rid of that table, you can only choose it (the implicit one).
OBIEE must join in a way or another your 2 dimensions, and in your BMM these dimensions are joined by a fact table, that's why you see it in your query.

SORT INTERNAL TABLE USING NON KEY OF THE INTERNAL TABLE

HI,
i have one query for the cdpos table of abap.
What i am looking is i want the latest CHANENR of the cdpos for that
objectid and tabname and fname in my internal table.
what i thought of doing was to sort my internal table with objectid changnr tabname fname in descending order
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please let me know what can i do

no, that is not what i am looking at,
I am saying say i have internal table cdpos
OBJECTCLAS      OBJECTID    CHANGENR   TABNAME                        FNAME
RECN_RECN      |0100TEST1   0000384409|    VICN01                        |RECNEND
RECN_RECN       0100TEST1   0000383462    VICN01                          RECNLIFNR
RECN_RECN       0100TEST1    0000360190   VICN01                         RECNEND
RECN_RECN        0100TEST1   0000340630    VICN01                         RECNEND
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How and when does a dimension table gets generated

Hi Gurus,
                 I am new into BI and I will be put into a project within 2 months. I have learned that dimension table contains the sid's of all the charateristics in the dimension table. My conclusions are like
1. Dimension table contains the dim id as the primary key.
2. Dimension table contains sid's of the characteristics.
3. Though sid's in the dimension table are primary keys in thier 'S' table they are not key in the dimension table.
My question is
1. Is there any chance to generate new dim id's for the same combination of sid's because sid's are not part of the key?
2. I got confused when and how does the dimension table gets generated ?
I have searched in the forum and google but still my doubts didnt get clarified. If anyone could throw some light on this topic I would really appreciate it.

HI,
All your conclusions are correct.
Now for your questions the answers are in line:
1. Is there any chance to generate new dim id's for the same combination of sid's because sid's are not part of the key?
    No new dim id's will be generated, dim Id is unique for the same combination of sid's .
2. I got confused when and how does the dimension table gets generated ?
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thanks,
Rahul

Load fact table with null dimension keys

Dear All,
We have OWB 10g R2 and ROLAP star schema. In our source system some rows don’t have all attributes populated with values (null value), and this empty attributes are dimension (business) keys in star schema. Is it possible to load fact table with such rows (some dimension keys are null) in the OWB mappings? We use cube operator in mappings.
Thanks And Regards
Miran

The dimension should have a row indicating UNKNOWN, this will have a business key outside of the normal range e.g. -999999.
In the mapping the missing business keys can then be NVL'd to -999999.
Cheers
Si

Problem in updating fa_additions SQL Error: ORA-01779: cannot modify a column which maps to a non key-preserved table

Hi,
After using sql loader to import informations in the table fa_mass_additions and after the functionnal uses a treatment to imputate this assets, it asks me to do an update on the table fa_additions to change the value of attribute1 but i get an error
Error report:
ORA-01779: cannot modify a column which maps to a non key-preserved table
ORA-06512: at line 11
01779. 00000 - "cannot modify a column which maps to a non key-preserved table"
*Cause:    An attempt was made to insert or update columns of a join view which
           map to a non-key-preserved table.
*Action:   Modify the underlying base tables directly.
please how can i do this update?

Hi,
The "fa_additions" is a view, not a table.
You should update the base table "fa_additions_b".
Regards,
Bashar

How to update a fact table when a dimension table is reloaded

We have implemented BI Apps 796. Insertion into W_EMPLOYEE_D table which stores all the employee information had stopped one year back as some company security policy restricted the informatica worklfows to pick up the data. (PER_ALL_PEOPLE_F was a HRMS table and it contained sensitive information line SSN and salary, was inaccessible to the user which informatica uses and the SDE mapping used to return 0 rows).
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The ROW_WID of W_EMPLOYEE_D is referenced in lot of fact tables and for all those missing employees the WID in the fact table is 0.
Now that we have all employees, how to make the FACT table point to the correct WID and not store 0. Has anyone faced this problem before?? Writing an update statement will be a tedious task as there are so many fact tables that join to w_employee_d. Also our company uses Sales, Procurement, Finance modules of OB Apps (which constitutes atleast 20 fact tables)
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Hello Kostis,
thank you for your answer. I don't fully understand you. Can you show me short example, please? I create alias table for time dimension on Physical Layer - original table is TimeDayDim and I create aliases TimeDayDim1, TimeDayDim2, TimeDayDim3, TimeDayDim4. Then I create foreign key Fact.Time1 -> TimeDayDim1, Fact.Time2 -> TimeDayDim2, Fact.Time3 -> TimeDayDim3, Fact.Time4 -> TimeDayDim4. And what now? Must I create these table api Bussines Model and create new time dimensions at bussiness model????
I need in Answers ONE Time dimension. I think I must split my fact table to four tables ... (time1, place1 ...) (time2, place2 ...) (time3 place3...) (time4 place4...) then link those tables to Time dimension (but I dont know where I can split those tables - on Physical Layer or on Bussines Layer).
I suppose that I will have in Answers one time dimension and four facts tables and I will be able to query them. (for example: Time.Days, Fact1.Place1, Fact3.Speed, Fact4.Count Criteria: Time.Year = 2008)
Best Regards Vlada

Incremental load into the Dimension table

Hi,
I have the problem in doing the incremental load of the dimension table.Before loading into the dimension table,i would like to check the data in the dimnesion table.
In my dimension table i have one not null surrogate key and the other null dimension tables.The not null surrogate key, i am populating with the Sequence Generator.
To do the incremental load i have done the following.
I made lookup into the dimension table and looked for a key.The key from the lookup table i have passed to the expression operator.In the expression operator i have created one field and hard coded one flag based on the key from the lookup table.I passed this flag to the filter operator and rest of the fields from the source.
By doing this i am not able to pass the new records to the dimension table.
Can you please help me.
I have another question also.
How do i update one not null key in the fact table.
Thanks
Vinay

Hi Mark,
Thanks for your help to solve my problem.I thought i share more information by giving the sql.
I am giving below the 2 sqls, i would like to achieve through OWB.
Both the following tasks need to be accomplished after loading the fact table.
task1:
UPDATE fact_table c
SET c.dimension_table_key =
(SELECT nvl(dimension_table.dimension_table_key,0)
FROM src_dimension_table t,
dimension_table dimension_table
WHERE c.ssn = t.ssn(+)
AND c.date_src_key = to_number(t.date_src(+), '99999999')
AND c.time_src_key = to_number(substr(t.time_src(+), 1, 4), '99999999')
AND c.wk_src = to_number(concat(t.wk_src_year(+), concat(t.wk_src_month(+), t.wk_src_day(+))), '99999999')
AND nvl(t.field1, 'Y') = nvl(dimension_table.field1, 'Y')
AND nvl(t.field2, 'Y') = nvl(dimension_table.field2, 'Y')
AND nvl(t.field3, 'Y') = nvl(dimension_table.field3, 'Y')
AND nvl(t.field4, 'Y') = nvl(dimension_table.field4, 'Y')
AND nvl(t.field5, 'Y') = nvl(dimension_table.field5, 'Y')
AND nvl(t.field6, 'Y') = nvl(dimension_table.field6, 'Y')
AND nvl(t.field7, 'Y') = nvl(dimension_table.field7, 'Y')
AND nvl(t.field8, 'Y') = nvl(dimension_table.field8, 'Y')
AND nvl(t.field9, 'Y') = nvl(dimension_table.field9, 'Y')
WHERE c.dimension_table_key = 0;
fact table in the above sql is fact_table
dimesion table in the above sql is dimension_table
source table for the dimension table is src_dimension_table
dimension_table_key is a not null key in the fact table
task2:
update fact_table cf
set cf.key_1 =
(select nvl(max(p.key_1),0) from dimension_table p
where p.field1 = cf.field1
and p.source='YY')
where cf.key_1 = 0;
fact table in the above sql is fact_table
dimesion table in the above sql is dimension_table
key_1 is a not null key in the fact table
Is it possible to achieve the above tasks through Oracle Warehouse builder(OWB).I created the mappings for loading the dimension table and fact table and they are working fine.But the above two queries i am not able to achieve through OWB.I would be thankful if you can help me out.
Thanks
Vinay

Does anybody know why when I aTrying to edit my yahoo profile using Firefox certain elements do not show up such as update "Load Photo" on the avatar page.

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'''Try the Firefox SafeMode''' to see how it works there. <br />
''A troubleshooting mode, which disables most Add-ons.'' <br />
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Dimension key 16 missing in dimension table /BIC/DZPP_CP1P

Hi all,
I have a problem with an infocube ZPP_CP1. I am not able to delete nor load any data. It was working fine till some time back.
Below is the outcome of running RSRV check on this cube. I tried to run the error correction in RSRV. But n o use
Please help.
Dimension key 16 missing in dimension table /BIC/DZPP_CP1P
Message no. RSRV018
Diagnosis
The dimension key 16 that appears as field KEY_ZPP_CP1P in the fact table, does not appear as a value of the DIMID field in the dimensions table /BIC/DZPP_CP1P.
There are 17580 fact records that use the dimension key 16.
The facts belonging to dimension key 16 are therefore no longer connected to the master data of the characteristic in dimension.
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The test investigates whether all the facts are zero. If this is the case, the system is able to remove the inconsistency by deleting these fact records. If the error cannot be removed, the only way to re-establish a consistent status is to reconstruct the InfoCube. It may be possible for SAP to correct the inconsistency, for which you should create an error message.
Procedure
This inconsistency can occur if you use methods other than those found in BW to delete data from the SAP BW tables (for example, maintaining tables manually, using your own coding or database tools).

Hi Ansel,
There has been no changes in the cube. I am getting this problem in my QA server. So I retransported the cube again from Dev to QA. But did not help me..
Any other ideas??
Regards,
Adarsh

Update/Load Dimension table attributes(non-key elements)

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