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Improved Reliability:In a centralised DBMS, a server failure stops the operations of the DBMS. Though, a failure at single site of a DDBMS, or a failure of a communication link creation some sites inaccessible, does not make the whole system inoperable. Distributed DBMSs are designed to continue to function despite such as failures. In particular, if data are replicated in various sites, a transaction requiring a particular data item may find it at various sites. Therefore, the failure of a site does not necessarily imply the shutdown of the system.
The failure of one site must be identified by the system, and appropriate action may be required to recover from the failure. The system has no longer used the services of the failed site. At last, when the failed site recovers or is repaired, mechanisms have to be available to integrate it smoothly back into the system. The recovery from failure in distributed systems is much more difficult than in a centralised system.
Define multivalued dependency. What do understand by trivial multivalued dependency? Ans: A multivalued dependency is a full constraint among two sets of attributes in a rela
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What is Structured Query Langauge (SQL)? SQL is a powerful set-oriented language which was formed by IBM research for the databases that adhere to the relational model. It havi
Given the following set of functional dependencies {cf→ bg, g → d, cdg → f, b → de, d → c} defined on R(b,c,d,e,f,g) a. Is cf→ e implied by the FDs? b. Is dg a superkey?
What does authentication refer? Authentication refers to the task of verifying the uniqueness of a person.
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Explain the concept of Modeling With Objects A model is a conceptual representation of a specification, design or system from a particular point of view. A modelling language
How can one distinguish among different kinds of parameters? Input parameters are used to pass data to subroutines. Output parameters are used to pass data from subrout
What are the authentication modes in SQL Server? How can it be changed? Windows mode and Mixed Mode - SQL and Windows. To alter authentication mode in SQL Server click Start, P
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