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Re-design an existing app's DB

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Last Modified: 2013-11-13
If you need to totally re-design an existing app's database, how much % effort would be distributed between

*Analyzing existing structure and schema and data flow and business rules and needed enhancement.
*Designing new schema
*Create new code for data access
*Create new reports
*migrate data
*test
*document

Any other critical piece missing in the above?

thank you.
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