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What is a Data Flow Diagram?
Data Flow Diagram: A data flow diagram is the graph that shows flow of data values from their sources in objects in the course of processes which transform them to their destinations in other objects.
It does not show how values are controlled while computation. The Data Flow Diagram shows functional relationship of values computed by a system. DFD contains processes which transform data, data flows which move data, actor objects which produce and consume data and data store objects which store data passively.
What are the reasons for having variable length records? What are the various ways to store variable length records? Variable-length records arise in a database in various wa
Example -Find the employee name, salary, department number and average salary of his/her department, for those employees whose salary is more than the average salary of that depart
Question 1: Define the term business intelligence tools? Briefly explain how the data from one end gets transformed into information at the other end? Definition Exp
What do you mean by persistence? How you will make your data persistent? Persistent data is the data, which has a longer lifetime than program which has created it. Enabling th
Explain the Static or conservative Two Phase Locking: Static (or conservative) Two Phase Locking: In this type of scheme, all the data items are locked earlier than any opera
Mention the various user privileges All privileges directly granted to the user or role. All privileges granted to roles that have been granted to the user or role.
#what is cursor its uses ? Explain it
Explain Candidate key? Candidate Key - A candidate key is a minimal superkey, that can be used to uniquely identify a tuple in the relation.
How is the database organised in Oracle? Database organized within Oracle in terms of table and table holds attributes and values. A database consists of one or more logical
Define DBMS? DBMS: database management system (DBMS) is computer software designed for the reason of supervision databases based on a variety of data models.
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