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Probelm:
(a) A distributed database (DDB) is a collection of multiple, logically interrelated databases which are physically distributed over a computer network"
(i) Give advantages of a Distributed Database as compared to a centralised database.
(ii) Differentiate between a Heterogeneous DDB and Homogeneous DDB and describe under what circumstances would such systems generally arise?
(iii) Show the advantages of having data replicated at various sites.
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
1. Item based services will be charged fixed prices, and time-based will be charged variably depending on time. Such as per hour. Item-based: Fixed, pedicure, waxing, threading, fa
Describe the Composite Key Composite Key: Sometimes one key is not enough to uniquely recognize a row. E.g. in a single class Roll is enough to search a student, but in the w
Concurrency issues Data integrity: Threads accessing same object need to be synchronized, such as: banking account. Deadlock: One or more threads in system are perman
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what is the relationship between receipt and owner entities in computer sales and service company
Add generation capabilities and/or tailor the built-in functionality of generator. This enables you to produce "all" the test data for the MySQL tables you produced in the previous
complete er diagram of textile industry management
Can a domain, assigned to a data element be changed? Yes. We can do so by just overwriting the entry in the field domain.
Describe the definition of a transaction in SQL Ans: The SQL transaction starts implicitly. Transactions are finished by either Commit work that commits the transaction and st
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