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Describe about Object oriented design
Object oriented design is concerned with developing an object oriented model of a software system to implement known requirements. Many OOD methods have been described since late 1980s. The most famous OOD methods include Wasserman, Buhr, Booch, and HOOD developed by the European Space Agency which can give following benefits: maintainability through simplified mapping to problem domain that provides for less analysis effort, less complexity in system design and easier verification by user.
Index And Tree Structure Let us talk about the data structure that is used for creating indexes. Can we use Binary Search Tree (BST) as Indexes? Let us initial reconsider
What is known as heap file organization? In the heap file organization, any record can be placed anywhere in the file where there is space for the record. There is no ordering
Define the concept of aggregation. Give two examples where this concept is useful. Ans: Aggregation transforms a relationship among the objects into a higher-level object. A
A relation instance indicates as r is a collection of tuples for a given relational schema at a exact point of time. A relation state r of the relation schema R (A 1 ,A 2 ,.....
Self-Join: In a self join a table is joined with itself. Let consider the following sample partial data of EMP table EMPNO ENAME MGRID
The advantages of a database management system (DBMS) include :- Data integrity and elimination of duplication.
a brief definition
Atomicity: It describes a transaction to be a one unit of processing. We can also say either a transaction will be finished completely or not at all. In the transaction example 1
Benefits of using heuristics
What is Primary key? Primary Key - Primary key is one of the candidate keys which uniquely identifies each row in the relation.
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