Identify the primary decisions a Database Administrator must make in order to manage such data, maintain data integrity, and maintain a database at its most ideal level. Provide a source for your response.
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You might enforce business rules through application logic as well as
through constraints, if you can filter out bad data before attempting an
insert or update. This might let you provide instant feedback to the
user, and reduce the load on the database. This technique is appropriate
when you can determine that data values are wrong or out of range
without checking against any data already in the table
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