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System implementation using one or more databases. Pros and cons.
What are the advantages and disadvantages of using one or many databases? 
What are the advantages and disadvantages of using one or many databases? 

Single environment:

+ Pool of licenses.
+ Only one environment to manage.
+ Only one place to login, common user experience.
+ Lower costs of adding common modifications.
+ Financial data consolidation.

Multiple environments:
+ Less complex testing.
+ Less risky in terms of server failure.
+ Less complex decision making.