Overview Of Process
Filed Under PCB, Process, Process Control Block, Stages, State | Posted on August 26, 2009
A process is an activity which takes place over time and which has a precise aim regarding the result to be achieved. The concept of a process is hierarchical which means that a process may consist of a partially ordered set of sub-processes. A process is rather abstract. It describes the essentials of the purpose, [...]
Database System Concepts – Data Model, Schemas and Database state
Filed Under Data, Data Model, Databases, Instance, Model, Schemas, State, Types | Posted on August 4, 2009
A data model is a collection of concepts that can be used to describe the structure of a database. By structure of the database we mean the data types, relationships, and constraints that should hold on the data. Most data models also include a set of basic operations for specifying retrievals and updates on database. [...]
