Sunday, January 18, 2009

Loading Dimension Tables in Data warehousing

Conventional (Slow) : All the constraints and keys are validated against the data before, it is loaded, this way data integrity is maintained.


Direct (Fast) : All the constraints and keys are disabled before the data is loaded. Once data is loaded, it is validated against all the constraints and keys.

If data is found invalid or dirty it is not included in index and all future processes are skipped on this data.

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