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What is Object Oriented model?
This model is based on collection of objects. An object has values stored in instance variables with in the object. An object also having bodies of code that operates on the object. These bodies of code are known methods. Objects that contain same types of values and the similar methods are grouped together into classes.
Consider the following relational database: STUDENT (name, student#, class, major) COURSE (course name, course#, credit hours, department) SECTION (section identifier, course#, sem
what is cascading rollback
What is the difference among a database schema and a database state? The collection of information stored in database at particular moment in time is known as database state a
What is authorization graph? Passing of authorization from single user to another can be shown by an authorization graph.
The natural join is equal to which product? The natural join is equal to Combination of projection and Cartesian product
what is Storage-Device Hierarchy question
Ask question #Minim 100 words accepted#what is recovery management component in database management system and how it is useful
Compare the Nested-loop join and block-nested loop join Ans: Nested loop join - It is costly as worst case cost, no. of block accesses needed is n r * b s + b r where b
Security: In a centralised system, access to the data can be simply controlled. Though, in a distributed DBMS not only does access to replicated data have to be controlled in many
Database Errors: An error is said to have occurred if the implementation of a command to manipulate the database cannot be successfully finished either due to inconsistent data or
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