You will probably get many similar responses to your query.
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Adabas is a far “better” DB than DB2. It is more efficient, more adaptable, etc. If you go to DB2 you lose all of this.
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I have heard ratios from 1.5 to 3 of DBA staff size increases.
I will leave it to others to add to the list. I will simpy end with a question:
Would you buy an automobile from a company that makes most of its money selling gasoline? If not, why buy software from a company that makes most of its money selling hardware.
steve