Database systems have many opposite efforts, Database Management System

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Database systems have many opposite efforts?


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Relational schema for person, Example: RELATIONAL SCHEMA for PERSON: ...

Example: RELATIONAL SCHEMA for PERSON: PERSON (PERSON_ID: integer, NAME: string, AGE: integer, ADDRESS: String) RELATION INSTANCE In this instance, m = 3 and n = 4

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Dependency Preservation It is obvious that the decomposition must be lossless so that we do not lose any information from the relation that is decomposed. Dependency preservati

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What is Alternate Key Alternate Key: This is the candidate key which is not taken as the primary key of the table. They are named so because although not the primary key, the

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Why do so various organizations use MySQL? Advantages: Open source Highly efficient Offers a high scalability in terms of size and connectivity. Highly prote

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What are the several forms of identity? a) Value b) Name c) Built-in

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A collection of a same kind of entities is known as an Entity Set or entity type. Example: For the COLLEGE database defines earlier objects of concern are Students, Faculty,

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Explain Superkey Ans: A superkey is described in the relational model of database organization like a set of attributes of a relation variable for which it holds that in all re

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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?

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Farmer Bob, Farmer Jane and Farmer Jose run a cow farming co-op. For every cow they keep the cow’s name, age (or date of birth), breed and numbered plastic ear tag. The each of t

12/5/2013 4:48:55 AM

The following are the risk & expenditure of database-


(i) Organizational Conflicts- Pooling data in a very common database could not be politically feasible in some organizations. Certain user groups may possibly not be willing to relinquish control over their data to the extent needed to integrate data. Moreover, risk involved in data sharing, as in that one group may damage another group''s data and potential system problems that might limit a group''s access to its own data could be viewed as more troublesome than beneficial. Such people problems may perhaps prevent a effectual implementation of a database system.


(ii) Development Project Failure- For a range of reasons, project to develop a database system could fail. Sometimes management was not fully convinced of value of database system in first place. A database project to seem to be taking too long may be terminated.


A project large in scope may be approximately impossible to complete in a reasonable time. Again, management and users become dissatisfied and project fails. Throughout course of a project, key personnel might unexpectedly leave a company. If replacement personnel cannot be found, then project might not be successfully completed.

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