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Describe an data dictionary?
A data dictionary is a data structure which keeps meta data about the structure of the database ie. the schema of the database.
Problem: (a) Briefly explain the ‘Hierarchical Database Model' using appropriate diagram. (b) List and briefly describe five potential benefits of the database approach comp
How many levels can be viewed in Architecture of the database ? Architecture of the database can be viewed as three levels.
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
System level permissions : With the use of data dictionary you can view them. Let us take the table name as user_sys_privs (used in oracle). DESCRIBE USER_SYS_PRI
What are axioms? Axioms or rules of inference give a simpler technique for reasoning about
A video rental company has several branches. The data held on each branch is the branch address made up of street, city, state, and zip code, and the telephone number. Ea
Briefly explain what is to be done during defining problem statement. To define Problem Statement of a system, define what is to be done and how you can go to implement that. Y
Winfield is a small city with a population of 22,000 with buses serves three routes in Winfield and neighboring areas. As the city’s IT director, you have been asked to set up an i
How external/conceptual mapping and conceptual /internal mapping is performed
Which method is used to key transformation ? A hash method is used to key transformation.
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