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Question
(a) Differentiate between the following terms:
(i) Distributed Database v/s Distributed Database management System (ii) Homogeneous Distributed Database v/s Heterogeneous Distributed Database
(b) Explain the following terminologies with regard to Distributed Database.
(i) Fragmentation (ii) Replication (iii) Transparency
(c) In the context of distributed database management systems, explain the following fragmentation rules and support your answer with an appropriate example of a Horizontal Fragmentation:
(i) Completeness (ii) Reconstruction (iii) Disjointness
does tables are called relations
Explain the disadvantages of a file processing system? Ans: Disadvantages of File Processing Systems include: 1) Data Redundancy 2) Data Inconsistency 3) Difficult to acce
Special comparison operator used in where Clause a. between. ...and...It gives range among two values (inclusive) Example: SELECT ENAME, SAL FROM EMP WHERE SAL BETWE
why we fregment at all?
System error :These contain errors in database system or the OS, example, deadlocks.Such errors are fairly hard to detect and need reprogramming the erroneous components of the sys
assignment
Cardinality of Relationship One-to-One Only one entity of the first set is linked to only one entity of the second set. E.g. A teacher teaches a student. Only one teacher
Clustering Indexes It may be an excellent idea to keep data of the students in the order of the programme they have registered as most of the data file accesses may need studen
Example : Search the name, department number and salary of employees drawing minimum salary in that department. SELECT ENAME, SAL, DEPTNO FROM EMP WHERE SAL IN (SELECT MI
random file sharing
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