Database Management Concepts
Foreign Keys and Data Integrity
A foreign key is the primary key of one table that has been placed into another table to create a common attribute.
In the relational model, keys are important because they are used to ensure that each row in a table is uniquely identifiable.
- A superkey is any key that uniquely identifies each row.
- A candidate key can be described as a minimal superkey, a superkey without any unnecessary attributes.
- A foreign key is the primary key of one table that has been placed into
Networking Interview Questions and Answers: A Comprehensive Guide
Networking Interview Questions And Answers Set – 2
Client-Server Architecture
What is meant by 3-Tier architecture?
In 3-tier Client/Server systems, the application logic (or process) resides in the middle tier, separate from the data and the user interface. This separation enhances scalability, robustness, and flexibility.
Example: TP monitor, Web.
What is meant by 2-Tier architecture?
In 2-tier Client/Server systems, the application logic is either embedded within the user interface on the client or
Read MoreCellular and Wireless Communication: Understanding the Basics
Cell Breathing ● Definition: Cell breathing refers to the phenomenon where the coverage area of a cell in a cellular network varies depending on the number of active users and the level of interference. ● Explanation: In a cellular network, as the number of active users increases, the interference and load on the cell increase, causing the cell’s coverage area to shrink. Conversely, when the number of users decreases, the coverage area expands. This dynamic adjustment helps manage network resources
Read MoreSoftware Development and Testing Methodologies
System Testing
System testing is a type of software testing where the entire integrated system is tested to evaluate its compliance with the specified requirements. It involves verifying both the functional and non-functional aspects of the system. The goal of system testing is to ensure that the software works as intended in a complete environment. The two key phases of system testing are:
Functional Testing Phase
This phase focuses on testing the functional aspects of the system, ensuring that the
Read MoreSoftware Design and Architecture
Structured Systems Design Model
It is the process of deciding which components, and interconnection between them, are needed to solve a well-specified problem.
Data Design
Transforms the information field model, created during analysis, into data structures that will be required to implement the software.
Structural Design
Defines the relationships between the main structural elements of the program. The main objective of structural design is to develop a modular program structure and represent the control
Read MoreNetwork Programming with Java: A Comprehensive Guide
Network Programming with Java
Strengths of Java for Network Programming
- Platform Independence: Runs on any OS without modification.
- Rich Libraries: java.net supports networking tasks easily.
- Multithreading: Handles multiple clients efficiently.
- Security: Inbuilt features like SSL/TLS for secure communication.
- Automatic Memory Management: Reduces memory leak risks.
Weaknesses of Java
- Performance: Slower due to JVM overhead.
- Low-Level Control: Less flexibility for low-level network tasks.
- Memory Usage: High