The document discusses database design concepts including the three phases of database design - conceptual, logical, and physical. It also discusses topics such as data modeling, normalization, transactions, and more. Key points include: - The conceptual phase constructs a model independent of physical considerations. The logical phase constructs a model based on a data model like relational but independent of specific DBMS. The physical phase produces a description of implementation on storage. - Normalization is a technique to minimize redundancy through functional dependencies and normalization forms like 1NF, 2NF, and 3NF. - Transactions ensure integrity through properties like atomicity, consistency, isolation, and durability (ACID).

1. Please describe 3 phases if database design

2. Conceptual

3. The process of constructing a model of the data used in an enterprise, independent of all physical consideration.

4. Logical

5. The process of constructing a model of the data used in an enterprise based on a specific data model (eg. relational), but independent of a particular DBMS and other physical consideration.

6. Physical

7. The process of producing a description of the implementation of the database on secondary storage; it describes the base relations, file organization, and indexes design used to achieve efficient access to the data, and any associated integrity constraints and security measures.