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CS403 - Database Management Systems - Lecture Handout 40

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Overview of Lecture

  • Introduction to Views
  • Views, Data Independence, Security
  • Choosing a Vertical and Horizontal Subset of a Table
  • A View Using Two Tables
  • A View of a View
  • A View Using a Function
  • Updates on Views

Views

Views are generally used to focus, simplify, and customize the perception each user has of the database. Views can be used as security mechanisms by allowing users to access data through the view, without granting the users permissions to directly access the underlying base tables of the view.

To Focus on Specific Data

Views allow users to focus on specific data that interests them and on the specific tasks for which they are responsible. Unnecessary data can be left out of the view. This also increases the security of the data because users can see only the data that is defined in the view and not the data in the underlying table.

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CS605 - Software Engineering II - Lecture Handout 39

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Environment Assessment

The legacy system also needs to be assessed from an environment’s perspective. This involves looking at the supplier, failure rate, age, performance, support requirements, maintenance cost, and interoperability.

These angles are elaborated in the following paragraph:

Supplier stability: Is the supplier still in existence? Is the supplier financially stable and likely to continue in existence? If the supplier is no longer in business, is the system maintained by someone else?

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