How To Implement Incremental Load In Fact Tables.
Feb 19, 2007
Hi all,
i have a fact table which loads through package,when
i m trying to load this table by running the package,i m truncating the
fact table and loading the fresh data,instaed of this without
truncating the fact table i have to implement the incremental logic in
this.
For this i can use SCD or Conditional split,but problem
here is i have many source tables to load this fact table,so its
very difficult to trace the changes in different source tables.
can any one help me out in this??????
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Dec 22, 2013
We need to implement incremental load in database. A sample scenario is, there is a view (INCOMEVW) which is build on top of a query like
CREATE VIEW INCOMEVW
AS
SELECT CLIENTID,COUNTRYNAME,SUM(OUTPUT.INCOME) AS INCOME
(SELECT EOCLIENT_ID AS CLIENTID,EOCOUNTRYNAME AS COUNTRYNAME,EOINCOME AS INCOME FROM EOCLIENT C INNER JOIN EOCOUNTRY CT ON
C.COUNTRYCODE=CT.COUNTRYCODE
[code]...
This is a sample view. As of now there is a full load happening from the source(select * from INCOMEVW) and loads to target table tbl_Income.We need to pick only the delta and load to the target table using a staging. The challenge is,
1) If we get the delta(Insert,update or deleted rows in the source tables EOCLIENT,EOCOUNTRY,ENCLIENT,ENCOUNTRY, how to load the incremental to
single target table tbl_Income.
2) How to do the Sum operation with group by in incremental load?
3) We are planning to have a daily incremental load and thinking to create the same table structure as source with Date and Flag column to identify
the date and whether that source row is an Insert or Update or Delete with the flag. But not sure how to frame something like this view and load to single target with Sum operations.
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Sep 24, 2015
I have a transaction table having about 40 crore rows in source. It don't have timestamp and unique key columns. It have only Bill_month and Bill_Year columns. Actually for loading this table into staging I have added a new datetime column by adding default bill_date as 01. Then
* First we delete last 3 month data from staging tables.
* Get last 3 months data from source table.
* Load that 3 months data from source to staging table.
We do this because we only get update for last three months data. Now I have to include this transaction table as Fact table in DW. What will be the best practice for loading the fact table by picking data form staging table. Also we have to look up with dimensions for Foreign Keys.
* Should I implement the same method of deleting last 3 months records and loading them again.
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Sep 22, 2006
Hi ,
I have situation where I get data from SRC Flat file and have to load Dimensional table and also fact table, using same data flow(have no other choice since I have to unpivot some src data). Since I have to load both tables in same data flow, I have to have a way to put load ordering constraint (I know informatica allows that). Does any one have any idea on how this can be done in SSIS?
I would be really grateful.
Thanks
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Jan 7, 2008
Hi,
Is there any way to maintain history of data while incremental load without using the Slowly changing dimension(SCD) concept?
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Mar 4, 2008
Hi All
I've created an SSIS package that loads data from source to destination, using Lookup and conditional Split to check New rows and changed rows for one table.
Now I want to take this father by loading data for multible table more that 100. I did it in T-SQL using dynamic sql and cursor.
How can I achive this using SSIS.
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Jan 31, 2008
I am attempting to perform an incremental load, inserting new rows and updating existing rows. I am using a lookup and everything works fine, except when it is the first load of the destination table. As there are no records in the table at all, the lookup fails. I thought of using a rowcount - if the count variable is zero load everything from temporary table to load table, otherwise perform lookup and incremental load.
Can anyone help?
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Oct 19, 2006
We are in the process of converting our existing incremental loads from DTS to SSIS.
Currently we get all the data for the past month into temp tables in the warehouse, compare with key fields add the new rows and update changed rows. All this is done using Execute SQL task.
Is there a better way to implement the incremental logic using SSIS any new objects that be used to avoid too much SQL codes? Performance is very important and we do a lot of aggregation after the load for the reports to run faster so that we can meet customer SLA's.
We have around 20 tables that needs to be loaded 4 have large amount of data between 20 and 40 million rows out of which we will be brining over around 100 thousand during each incremental run. The other tables have less than 100,000 rows so does not hurt truncating and reloading the entire table.
Any assistance is appreciated.
Thanks!
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Apr 29, 2008
Hi everyone. I'm trying to figure out how to run an incremental load into a Staging table.
At this point I'm not trying to Conditional Split it between "New" and "Changed" records... just the load.
The logic in my head says that after each load, you can take the most recent "modified" date/time and store that in an incremental load table. That way, next time you run an incremental load, you just have to look up that "modified" date/time, and only load the source records with a "modified" date/time later than the record in your incremental load table. Does that plan sound feasible?
I think so far my problem is that my source is on an ADO.NET connection, and my incremental load table is on my SQL Server. So when I do my load from the ADO.NET database, I cannot read the data from the incremental load table.
Is my logic flawed?
Any help would be appreciated.
Thank you very much!
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Jun 6, 2014
I required query for Incremental Load of CDC using Query
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Apr 30, 2015
I have a table in Server A and it has 5 columns. One is Address & ID, CreateDatetime,..
I need to transfer data from this table from Server A to server B for a report pupose. The Address column in this table has some places two address in the table. I am giving ex below
Address
Houston, Dallas
Redmond
Sacramento
New Jersey, New York
I want to avoid the rows where address are two Houston, Dallas & New Jersey, NewYork to the destination table in server B and need to do incremental loads.
how to proceed with this?
The version we are using is Sql Server standard edition 2008r2
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Jun 4, 2015
We have build a powerpivotmodel that uses a couple of datasources. The user extracts on monthly base an excel file with 20 samples (randomly) from the model to check some aspects of the input. He can put Yes or No into a column if he agrees or not and fill in a remark field. Next this excel file is loaded back into the powerpivot model (in a nightly batch) and the Yes/No field and the remark field are added to the original data. If the user refreshes his excel sample file from the pivot, the remark and YN field will be filled with the values he added. So far so good. One moth later when he extracts the file for a new month a problem arises. Since the excel file only has data for the new month, when the PP-model is reloaded the data for the previous month will be lost. So we need some sort of incremental load for the excel file. Is that possible and is this the best way to handle this situation?
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Oct 18, 2015
i want to create one ssis packages using the index bite or hash bite.
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Jan 2, 2014
We are designing a Staging layer to handle incremental load. I want to start with a simple scenario to design the staging.
In the source database There are two tables ex, tbl_Department, tbl_Employee. Both this table is loading a single table at destination database ex, tbl_EmployeRecord.
The query which is loading tbl_EmployeRecord is, SELECT EMPID,EMPNAME,DEPTNAME FROM tbl_Department D INNER JOIN tbl_Employee E ON D.DEPARTMENTID=E.DEPARTMENTID.
Now, we need to identify incremental load in tbl_Department, tbl_Employee and store it in staging and load only the incremental load to the destination.
The columns of the tables are,
tbl_Department : DEPARTMENTID,DEPTNAME
tbl_Employee : EMPID,EMPNAME,DEPARTMENTID
tbl_EmployeRecord : EMPID,EMPNAME,DEPTNAME
How to design the staging for this to handle Insert, Update and Delete.
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Aug 15, 2007
I'm putting together a Kimball method SSIS package. My factSales table has an OrderRep key. If a match isn't found in the dimRep table I am inserting a dummy dimRep row and going on. That seems to be working.
My question is what do I do when the OLTP sales row has NULL for the OrderRep. This is possible; every sale does not have to have an order rep. My package is seeing that as a non match and trying to create a dummy row in the dimRep table for every NULL. I really don't want to do this. I can trap for the NULL rep and convert it to "unknown" or something but then the program would still create a single row in the dimRep table for unknown. Is that the best way to handle this? Or is there a way to trap for NULL and ignore the entire lookup process? A conditional split before every key lookup?
I have about 5 or 6 other dimension tables that will have the same NULL possibility.
Thanks.
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Aug 25, 2006
Hi All,
I am just curious to know how I can load data from a data warehouse to an Analysis Service Cube (both to the fact tables and dimensions).
Does any body have some way to achieve this?
I appreciate if any body provide me a good material which describe this scenario.
Sincerely,
--Amde
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Oct 20, 2014
I have a stored procedure in that attempts to perform a WHERE NOT EXISTS check to insert new records. If the table is empty, the procedure will load the table. However, an insert does not occur when a change to one or more source fields occurs against an existing record. The following is my code:
declare
@Created_By nchar(50)
,@Created_Date datetime
,@Updated_By nchar(50)
,@Updated_Date datetime
select @Created_By = system_user
[code]....
I expected that when one of the source values of any field in the second WHERE clause changes, that the procedure would insert a new record. Why is this not happening? One other note: I am not 'allowed' to use MERGE.
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Feb 14, 2006
I need help from you data warehouse / SSIS experts out there! I have a Transaction Fact Table with dollar amounts as the measurements. The grain is one row per transaction. I want to roll this up into a Monthly Periodic Snapshot based on 5 keys. I am having no problem where there is transaction data for each month.
However, the problem I am having is - how do I gracefully insert the Monthly rows for the five keys where there was no activity in the transaction fact table - I am sure there is a slick way to do this with SSIS but I am definitely having a mental block on how to accomplish this. Any help would be appreciated!
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Apr 9, 2008
Hello,
I have developed some packages to load data into "Fact" tables in the data warehouse.
Some packages are OK, other ones not. What is the problem?: some packages load fact tables with lots of "Lookup - Data Flow Transformation" into the "data flow task" (lookup against dimension tables) but they are very very slow, too much slow to be choosen as a solution.
Do you have any other solutions to avoid using "Lookup - Data Flow Transformation"? Any other solution (SSIS, TSQL and so on....) is welcome to speed up the Fact table loading process.
Thank in advance
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Mar 20, 2008
Can Anybody explain me this how to Do this ?
Is this done by definning the Primary key and foreign key constraints ?
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Dec 15, 2014
I need to perform some operations that seem to require multiple nested tables.
Is the following code the way I should be attempting this or is there a better way?
Here is the sample code:
SELECT tt.tdl_ID, tt.tx_ID, adj.Prof_Chgs, rc.Rvu_Comp
FROM Table1 as tt
LEFT JOIN (
SELECT tt1.Tdl_Id,
CASE
WHEN tt1.tdl_ID = '1000'
[code]....
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May 11, 2005
Hi
I have a fact table in which i have a String column now i want to show it in the mdx queries..when i add it as a measure it shows some numerical values in the cube i cannot even add it as a member propeties due to some datwarehouse design constraints..so can anyone out there help me please....it urgent
Thankx in advance
regards
Hemant
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Dec 28, 2007
Hi Guyz
it is taken from SQL2K5 SP2 readme.txt. Anyone have idea what to do to implement this ?
Our sp2 is failing. we suspect the above problem and researching it.we are running on default instance of SQL2K5 on win2003 ent sp2
"When you apply SP2, Setup upgrades system databases. If you have implemented restrictions on the ALTER DATABASE syntax, this upgrade may fail. Restrictions to ALTER DATABASE may include the following:
Explicitly denying the ALTER DATABASE statement.
A data definition language (DDL) trigger on ALTER DATABASE that rolls back the transaction containing the ALTER DATABASE statement.
If you have restrictions on ALTER DATABASE, and Setup fails to upgrade system databases to SP2, you must disable these restrictions and then re-run Setup."
thanks in advance.
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Jan 17, 2005
I am building a health care application that marries transaction-level data (health care services provided) with person-level characteristics that have a time-dimension. The person-level characteristics are diseases that the person has (these disease all have a start and some have an end date). The diseases are stored in a table in which the foreign keys are a person-identifier, a time identifier (month/year) and a surrogate for the disease. Persons can have more than one disease at a time (the diseases are NOT mutually-exclusive). There are no measures in this table. The transaction table has a foreign key for person and time (month/day/year), a procedure code (the type of service rendered) and money (the cost of the services).
How do I answer the following questions:
What is the total cost of care (the sum of all service costs) last year for persons with "disease A"?
What is the total cost of care last year for persons with "disease A" AND "disease B"?
What is the total cost of care last year for persons with "disease A" OR "disease B"?
I've tried a factless fact table but can't get it to work. If anyone has the right solution and can communicate to me before I slit my wrists, I would be greatly appreciative!!!
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Dec 6, 2007
I have a cube with 2 fact tables and I would like to create a calculated measure that uses values from both tables like:
fact1.measure1 / fact2.measure2
I can't see how to do this?
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Feb 6, 2008
Hi All,
What is the best way to move data from Online system tro data warehouse?
I have created 3 dimension tables(product,date and customer tables) and
I wanna create fact table and get foreign keys from dimension tables.
What is the best method to do that in SSIS?
thanks
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May 16, 2007
Hi,
I am new at SSIS and I am trying to create a Datawarehouse using SSIS. I have the data files as flat files I have the Dimensional Model ready on Paper and Now I need to use the SSIS for the ETL process.
I am trying to figure out how to make dimension tables in SSIS? I mean I want to create the 5 Dimension tables and then create a Fact table out of it but I cant understand where to start? Can any one tell me how we create Dimesion tables in SSIS. Like one of the dimesion tables I need to create uses 2 flat files and is like a flattened dimension, How would I create this in SSIS?
Even if there is any tutorial which shows this step by step do let me know. I would really appreciate any guidance on this.
Thanks,
Sarang
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Mar 6, 2008
Hi All,
I want you an urgent respones, I want to add a column to a Dim_table and Fact_table, the Dim_table is sourcing from different database table and now the new column is going to source from another DB, thus without changing the structure of the table relationship can i add a column? To make it clear Dim_table has got Clomun1 from table1, Clomun2 from table2, Clomun3 From table3, Clomun4 From table4. Now I want Clomun5 From table5. How do i add and let it source from table5.
Thank you for your qiuck response.
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Oct 12, 2006
Hi,
I have a situation where I have 4 tables:
1. 2 Dimensional tables(Parent), DIM1 with 50000 rows, and DIM2 with 1000 rows
2. Fact 1 with 50 columns, 25 Million rows and with FK to DIM1 and DIM2
3. Fact 2 with 40 columns, and 25 Million rows and with FK to DIM1 & DIM2 tables.
Actually the fact 1 and fact 2 have same related data but since our Analysis cube person wanted the fact table not to have more than 50 columns we divided the tables into 2, but they have the same compound key.
Above said, I have a situation where I have to select all the columns, in both fact tables, and do a group by. I wrote the query and ran "Analyze Query in the Database Engine Tuning Advisor" for it. It gave bunch of recomendations about the statistics and indexes which I created. When I executed the query the result came up in matter of seconds, which was good.
In the query I had a condition having MarketName='Bridgeview' and DateID = 344 (FK of today-1).
When I wanted the data for last 30 days I changed to DateID in ( > FK of today -32 and < FK of today), the query responded and worked fine.
But when I changed the query to get MarketName='Aurora' (other than I used when I ran Tuning Advisor), the result returned is empty set. When I removed the MarketName condition, it is supposed to return all markets' data, but it returns only Bridgeview data.
I know the data is in the table for all markets, since reports are rendered from these fact tables for all of these markets(also ran queries to check the fact table data).
I am unable to point out the reason why the query behaves like this. It responds to the date change, but not to the MarketName change.
I really appreciate if anyone can help me point out the problem.
Thanks,
Venkat
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Nov 21, 2007
Hello,
I have the following Datawarehouse problem (SQL Server 2005 and SSIS 2005):
2 Fact tables and both with some foreign surrogate keys of dimensions (some of them with common dimensions, other with different dimensions).
I have to create another FACT table that is an aggregation and join table between the 2 ones.
How can I do?
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Jul 10, 2007
Hello Everybody,
Can anybody please let me know the procedure for loading data into Dimensions & Facts? And what is the sequence of loading?
Thanks in Advance
Rajesh
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Dec 17, 2007
Hi there, my question is really simple. I want to setup an automatic task in SSIS that drops the tables in the target database and substitutes them with tables from the source database. We are talking about two or three dimension tables and one fact table. The dimension tables are pretty small. The fact table will contain, at maximum, 300,000 rows and 12 columns. I do not use delta or flag historisation btw. What tasks in SSIS would you suggest to use?
BTW I'm new to SSIS... ;-) Thanks in advance!
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Jan 19, 2006
Greetings,
Iam new to SQLl2005. Iam using DTS to transfer data from my source to the warehouse. I have a couple of tables in my source whein I have to join these to tables fields and insert the same in teh warehouse fact table. I have used a Join query in my Oledb source component, What other component needs to be used to insert the data into the fact table.
I also need to extract same data with aggregation and insert the same into an another Fact table.
Kindly help.
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