DATABASE: WHAT IS DATABASE: WHAT IS RDBMS • Relational data base management system • Used to manage the database • Introduced by codd . What is table ...
Home (PCB) or Task Control Block (TCB) • As the operating system supports multi-programmin g , it needs to keep track of all the processes • T he process control block (PCB) is used to track the proces s ’s execution status. • Each block of memory contains information about the process state, program counter, stack pointe r , status of opened files, scheduling algorithms, etc. • All these information is required and must be saved when the process is switched from one state to...
Home Context Switching in Operating System • A context switch is the mechanism to store and restore the state or context of a CPU in Process Control block so that a process execution can be resumed from the same point at a later time. Context Switching Trigger s : There are three major triggers for context switching. Multitasking: In a multitasking environment, a process is switched out of the CPU so another process can be run. • The state of the old process is saved ...
Home Multitasking (Time sharing) Multitasking has the same meaning of multiprogramming but in a more general sense, as it refers to having multiple (programs, processes, tasks, threads) running at the same time. This term is used in modern operating systems when multiple tasks share a common processing resource (e.g., CPU and Memory). Multitasking:As the name itself suggests, multi tasking refers to execution of multiple tasks (say processes, programs, threads etc.) at a time. Ex: In the modern operating systems, we are able to play MP3 music, edit documents in Microsoft Word, surf the Google Chrome all simultaneously, this is accomplished by means of multi tasking. Multitasking is a logical extension of multi programming. Multi programming In a modern computing system, there are usually several concurrent application processes which want to execute. Now it is the responsibility of the Operating System to manage all...
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