Buffer
September 18, 2016Buffer cache When a process wants to access data from a file, the kernel brings the data into main memory,... View Article
Tag Archive: Engineering
Grand Unified Boot loader (GRUB)
September 18, 2016GRUB GRUB is an operating system independent boot loader A multiboot software packet Flexible command line interface File system access... View Article
Kernel
September 18, 2016Introduction A kernel is a central component of an operating system. It acts as an interface between the user applications... View Article
Operating System
September 18, 2016What is operating system? Computer = set of resources Processors, memory, I/O & communication devices OS Enable use of resources... View Article
Line Coding Schemes
September 18, 2016Line Coding Unipolar Only two voltage levels are used. (1 means sending something, 0 means not sending) All signal levels... View Article
Line Coding
September 18, 2016Introduction The process of converting digital data to digital signals. Digital data – sequences of bits. Characteristics Data rate vs. signal... View Article
Extended Entity Relationship Model (EER Diagram)
September 17, 2016The E-R model that is supported with the additional semantic concepts is called the extended entity relationship model. Specialization: It... View Article
Types of keys in E-R modeling
September 17, 2016Super key: Allows us to identify uniquely an entity in the entity set. Example: Roll_No attribute of student distinguishes student... View Article
Constraints of E-R Modeling
September 17, 2016An E-R enterprise schema may define certain constraints to which the contents of a database system must conform. Mapping Cardinalities... View Article
Data Models
September 17, 2016Entity relationship model Keywords: Entity, Relationship, Attributes Advantages: Easy to develop, Mapping cardinalities, primary key, generalization and specialization Disadvantages: not... View Article