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The Database administrator (DBA) uses the data dictionary in each phase of a database life cycle, beginning from the data gathering phase to the design, execution and maintenance phases. Documentation given by a data dictionary is as valuable to end users and managers, as it is necessary to the programmers. Users can decide their applications with the database only if they know exactly what is stored in it. For example, the explanation of a data item in a data dictionary may have its origin and other text description in plain English, in addition to its data format. Therefore, users and managers will be able to see exactly what is available in the database. A data dictionary is a road map which helps users to access information within a large database.
Explain the term - Adjustment of inheritance The inheritance can be enlarged as object design progresses by changing class structure. The designer should do: i) Adjust or r
Explain the concepts of relational data model? Relational Data Model - The relational model was first introduced through Prof. E.F. Codd of the IBM Research in the year 1970
What is DML Query Langauge? Data Manipulation Language (DML) - A data manipulation language is a language in which enables users to access or manipulate data as organized throu
Explain Two phase locking protocol A transaction is consider as to follow the two-phase locking protocol if all locking operations precede the first unlock operation in the tra
SET concept is used in which type of modelling? SET concept is used in Network Model.
what is correlation in nested query
What is an index? An index is a structure that helps to place desired records of a relation quickly, without probing all records.
Explain concept of inheritance with support of suitable example. Inheritance Inheritance is one of milestone of object-oriented programming language as it allows a creati
Sparse and Dense Indexes These indexes in principle are the similar as that of indexes used at the back of the book. The key facts of the indexes are: They are arranged
You have a friend that runs a motor bike club that holds racing events at various venues on weekends, on a monthly basis. Some venues are private race tracks and some are dirt trac
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