ETL process

Question

hi all,
I am new to OWB10g. I need to know what is exact ETL process to follow in OWB. And how to do the incremental loading. please tell me the Steps to follow??

Answer 1

If you are referring to incremental in terms of time/date increments, you can accomplish this in a mapping as follows:
1. SOURCE TABLE --> FILTER (filters out data so only the last 5 days, or last 1 week, or last 2 weeks of data will be accepted).
2. FILTER --> TARGET TABLE 1(This can be a simple load type of truncate/insert)
3. TARGET TABLE 1 --> Historical TARGET TABLE (This can be a load type of 'upsert' known as a merge or insert/update.)
What happens here is a source table has only the last few days or weeks (you specify it) of data extracted. It then truncates the target table, and loads only the data that the filter extracted. This will be a small subset of the original large source data. Finally, you can merge this smaller subset into the historical table, which will merge based on certain matching criteria. This Historical table will never truncate, therefore it will hold all history. The initial TARGET TABLE 1 will only hold a small subset of data, and can only be queried when you need to look at only the most recent extraction quickly.
-Greg