What is a three tier data warehouse?
The 3 tiers are:
1. Data tier – bottom tier – consists of the database
2. Application tier – middle tier – consists of the analytical server
3. Presentation tier – tier that interacts with the end-user
What are the various transformation available?
|
|
|
the various type of transformation in informatica |
|
|
How to determine what records to extract?
When addressing a table some dimension key must reflect the need for a record to get extracted. Mostly it will be from time dimension (e.g. date >= 1st of current mth) or a transaction flag (e.g. Order Invoiced Stat). Foolproof would be adding an archive flag to record which gets reset when record changes.
Interviewfaqs's jobportal 