Database Fundamentals [DB2] by D. Sharma, et al.,
By D. Sharma, et al.,
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There are duplicate tuples in a relation. E. None of the above 8. A relation can have: A. A domain. B. An instance. C. A value. D. A degree. E. None of the above 9. Which of the following statements is true? A. A primary key is also a candidate key. B. Each relation has at least one foreign key. C. Foreign keys can’t have null values. D. A primary key is also an alternate key. E. None of the above 10. When deleting a tuple from a relation that has a primary key defined, which of the following options on a foreign key clause would delete all tuples with the same value in the foreign key relation?
3 Database Administrator (DBA) A database administrator (DBA) is responsible for the maintenance, performance, integrity and security of a database. Additional role requirements are likely to include planning, development and troubleshooting. The work of a database administrator (DBA) varies according to the nature of the employing organization and the level of responsibility associated with the post. The work may be pure maintenance or it may also involve specializing in database development. Typical responsibilities include some or all of the following: Establishing the needs of users and monitoring user access and security; Monitoring performance and managing parameters to provide fast query responses to front-end users; Mapping out the conceptual design for a planned database in outline; Take into account both, back-end organization of data and front-end accessibility for end users; Refining the logical design so that it can be translated into a specific data model; Further refining the physical design to meet system storage requirements; Installing and testing new versions of the database management system (DBMS); Maintaining data standards, including adherence to the Data Protection Act; Writing database documentation, including data standards, procedures and definitions for the data dictionary (metadata); Controlling access permissions and privileges; Developing, managing and testing backup and recovery plans; Ensuring that storage, archiving, backup and recovery procedures are functioning correctly; Capacity planning; Database Fundamentals 34 Working closely with IT project managers, database programmers and Web developers; Communicating regularly with technical, applications and operational staff to ensure database integrity and security; Commissioning and installing new applications.
Data models must capture data structure and characteristics, the relationships between data, the data validation rules and constraints and all transformations the data must support. You can think of it as a communication tool between designers, programmers and end-users of a database. There are several types of data models on the market today and each of it has its own features. However, in this chapter we focus on the relational data model, which is the prevalent one in today's database market.