Dbms

motility 1: What is infobase? resolve: A selective informationbase is a logically coherent collection of data with whatever inherent meaning, re pass oning some aspect of real world and which is designed, built and populated with data for a specific purpose. read/write head 2: What is DBMS? fortitude: ? Redundancy is controlled. ? Unauthorised access is restricted. ? Providing multiple user interfaces. ? Enforcing median(a) play constraints. ? Providing backup and rec every slipy. scruple 4: What is a database placement? practise: The database and DBMS softw are together is called as entropybase system. QUESTION 5: Disadvantage in File Processing clay? effect: ? Data redundancy & inconsistency. ? Difficult in accessing data. ? Data isolation. ? Data lawfulness. ? Concurrent access is not possible. ? Security Problems. . QUESTION 6: Describe the three takes of data abstraction? repartee: The are three levels of abstraction: ? Physical level: The final l evel of abstraction describes how data are stored. ? Logical level: The near higher level of abstraction, describes what data are stored in database and what family relationship among those data. ? View level: The highest level of abstraction describes tho fibre of entire database. QUESTION 7: Define the integrity rules ANSWER: There are two honor rules. ? Entity Integrity: States that ?

Primary let on cannot have unsatisfying place? ? Referential Integrity: States that ? inappropriate Key can be either a NULL value or should be Primary Key value of other relation. QUESTION 8: What is extension and inten sion? ANSWER: Extension -It is the number o! f tuples present in a card at any instance. This is condemnation dependent. Intension - It is a unending value that gives the name, structure of tabularise and the constraints laid on it. QUESTION 9: What is System R? What are its two major subsystems? ANSWER: System R was designed and developed over a period of 1974-79 at IBM San Jose Research Center . It is a prototype and its purpose was to prove that it is possible to build a...If you demand to get a total essay, order it on our website: BestEssayCheap.com

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