Database development life cycle unit 2 part 1
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The database development life cycle (DDLC) is a six-phase process for designing, implementing, and maintaining a database system to meet an organization's information needs. The six phases are: 1) initial study, 2) design, 3) implementation and loading, 4) testing and evaluation, 5) operation, and 6) maintenance and evolution. In the initial study phase, the current system is examined to analyze problems, define objectives and scope. The design phase focuses on creating the database model. In implementation, the design is executed by installing the DBMS, creating databases, and loading data. Testing and evaluation ensures the database performs as expected. During operation, the completed system is used. Maintenance involves routine activities like backups
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Database development life cycle unit 2 part 1
- 1. Unit -2 DATABASE DEVELOPMENT LIFE CYCLE - PART 1 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 1
- 2. Database development Life Cycle A database system is a fundamental component of the larger enterprise information system. The database development life cycle (DDLC) is a process of designing, implementing and maintaining a database system to meet strategic or operational information needs of an organisation or enterprise. The Database Life Cycle (DBLC) contains six phases: 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 2
- 3. Database Development Life Cycle 1. Database initial study 2. Database design 3. Implementation and loading 4. Testing and evaluation 5. Operation 6. Maintenance and evolution. 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 3
- 4. Database Development Life Cycle 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 4
- 5. Database Development Life Cycle 1. The Database Initial Study: In the Database initial study, the designer must examine the current system’s operation within the company and determine how and why the current system fails. The overall purpose of the database initial study is to: ◦ Analyze the company situation. ◦ Define problems and constraints. ◦ Define objectives. ◦ Define scope and boundaries. 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 5
- 6. Database Development Life Cycle 2. Database Design: The second phase focuses on the design of the database model that will support company operations and objectives. This is arguably the most critical DBLC phase: making sure that the final product meets user and system requirements. As you examine the procedures required to complete the design phase in the DBLC, remember these points: ◦ The process of database design is loosely related to the analysis and design of a larger system. The data component is only one element of a larger information system. ◦ The systems analysts or systems programmers are in charge of designing the other system components. Their activities create the procedures that will help transform the data within the database into useful information. 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 6
- 7. Database Development Life Cycle 3. Implementation and Loading: The output of the database design phase is a series of instructions detailing the creation of tables, attributes, domains, views, indexes, security constraints, and storage and performance guidelines. In this phase, you actually implement all these design specifications. ◦ Install the DBMS: ◦ Create the Database(s) ◦ Load or Convert the Data 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 7
- 8. Database Development Life Cycle Testing and Evaluation: In the design phase, decisions were made to ensure integrity, security, performance, and recoverability of the database. During implementation and loading, these plans were put into place. In testing and evaluation, the DBA tests and fine-tunes the database to ensure that it performs as expected. This phase occurs in conjunction with applications programming. ◦ Test the Database ◦ Fine-Tune the Database ◦ Evaluate the Database and Its Application Programs 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 8
- 9. Database Development Life Cycle 5. Operation Once the database has passed the evaluation stage, it is considered to be operational. At that point, the database, its management, its users, and its application programs constitute a complete information system. The beginning of the operational phase invariably starts the process of system evolution. 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 9
- 10. Database Development Life Cycle 6. Maintenance and Evolution The database administrator must be prepared to perform routine maintenance activities within the database. Some of the required periodic maintenance activities include: ◦ Preventive maintenance (backup). ◦ Corrective maintenance (recovery). ◦ Adaptive maintenance (enhancing performance, adding entities and attributes, and so on). ◦ Assignment of access permissions and their maintenance for new and old users. 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 10
- 11. References 1. https://www.oreilly.com/library/view/database-systems- concepts/9788177585674/9788177585674_ch08lev1sec3.html 2. http://www.myreadingroom.co.in/notes-and-studymaterial/65-dbms/506-database- development-life-cycle.html 8/14/2019 DATABASE DEVELOPMENT LIFE CYCLE -UNIT 2 PART 1- BY RAM K PALIWAL 11