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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.
read-set(T) : Each data items that are read by a transaction T Timestamps : for all transaction T, the start-time and the end time are reserved for all the three phases.
The State of NewYork certifies firefighters throughout state and keep track all of them, as well as of the state’s fire departments. Each fire department has unique department numb
Describe in brief about DBMS ?
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explain various steps uses in evaluation and maintenance of MIS.
Creating views with Replace option : This option is used to alter the definition of the view without recreating and dropping it or regranting object privileges previously granted o
What is the function of IO/M signal in the 8085? It is a status signal. It is used to differentiate among memory locations and I/O operations. When this signal is low (IO/M = 0
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