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DEFECTS ARE ONE OF THE MAIN REASON THAT CAUSE SIGNIFICANT
PROJECT REWORK, DELAYS AND COST OVER RUNS.
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OBIA 7.9.6.4
Full & Incremental Loading
What is Full Load
Full load means loading data for the very first time onto the BI
Apps Datawarehouse
Full load is also undertaken when data seems corrupt and needs
to be cleaned again
Data extracted is of huge volume and ETL mappings might run for
long duration, often a few days
Data volume controlled by INITIAL EXTRACT DATE parameters
Some developers feel full load is the solution to just about any
problem, which is incorrect.
What is Incremental Load
This is the load which customers generally run each day
Only the incremental changes in source, compared to previous
load are captured and loaded
Data volume is low.
The Incremental Data Set or the Delta Data is determined mostly
by LAST EXTRACT DATE parameter
Logic and Calculations
Delta Data = Current source data Current Warehouse Data
Delta Data = Source record change/insert date > Last ETL
Extract Date
Delta Data = New records + Existing Changed records
New records Inserted, Changed records updated ( in
Warehouse)
SQL Changes for Incremental Load
Methodology in Informatica
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OBIA 7.9.6.4 Full & Incremental Loading
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Quiz
Which DAC parameter controls full and incremental load ?1.
The Infa mapping contains Incremental load SQL. (TRUE / FALSE
)2.
How many Infa sessions are created for each Infa mapping ( 1 , 2
, 3 , 4 )3.
Which type of ETL load takes longer time ( FULL / Incremental
)4.
How does DAC trigger the correct Infa mapping for either the
full load or Incremental load ?5.
If one incremental load was executed from 5th Jan 2013 and the
users later on decide to re-collect data from 1st Jan 2013,
what
should they do ?
6.
Tagged un derOBI Applications 7964 Full & Incremental
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OBIA 7.9.6.4 Full & Incremental Loading
http://www.adivaconsulting.com/blog-bi-apps/item/118-obi-applicatio...
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