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What are the disadvantages of relational data ?
Disadvantages
• Performance - If the number of tables among that relationships to be established are large and the tables themselves are voluminous, the performance within responding to queries is absolutely degraded.
• Unsuitable for Hierarchies - Although the relational database approach is a logically attractive, commercially feasible approach, but if the data is for instance naturally organized in a hierarchical manner and stored as such, the hierarchical approach might give better results.
Answer SQL Queries to extract data from data tables and questions on mapping conceptual data models into relational data model.
Failure Controlling Methods: Failures can be handled using different recovery methods that are talk about later in the unit. But the first question is doing we really require recov
statical data
Although how will the system recover The selection of REDO or UNDO for a transaction for the recovery is completed on the basis of the state of the transactions. This state is
What are the properties in a relation ? In a relation Ordering of rows is immaterial and No two rows are identical.
Question 1 What do you mean by database management system? Question 2 Write a note on Object-Oriented Model Question 3 Explain Sequential File Organization Question
What do you mean by an execution plan? Why is it used? How will you view it? a.) An execution plan can be known as a road map which textually or graphically illustrates the dat
What is called an evaluation primitive? A relational algebra operation annotated with instructions on how to evaluate is known as an evaluation primitive.
Analyzing Association Traversal Association Traversal shall be understood properly for the association design explanation. Analyzing association traversal means analyzing tra
Define Deadlock prevention These protocols make sure that the system will never enter a deadlock state. There are two methods to deadlock prevention. One approach makes sure t
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