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   • Operating systems vs. database management systems

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     Answered Feb 08, 2019 · 2 votes

     For example, what happens when a user program tries to access a file? That depends on how the user program is accessing the file. fopen/read/write calls are offered by the filesystem managed by the OS.

     Does a system call get invoked that is then handled by the OS to find the correct file and data? If a database is used, the database manages it's own set of data files, and indexes into those data files. The database engine executes IO requests which are handled by the underlying OS. Additionally, the database most possibly will also do caching to reduce file IO.

     Or is the call handled by the DBMS, which can then more efficiently find the data (tuple/record) using a B+ tree for example? And then the DBMS makes a call to the OS to actually get the data? Depending on the database query, the data can be read sequentially, or accessed randomly via an index lookup.

     Is the database only accessed if using a programming language like SQL? If I just write a simple C program that writes a file to disk, is the data really stored in a "database" or just in some block on disk where the information for the file is stored within the inode for that file? It's stored in the filesystem that might used a block based design. A simple C program should use an SDK to connect to a database, and then invoke SQL statements.

     Hope this helps!

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   • Operating Systems-Input Output Systems Archives

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   • Operating Systems | Input Output Systems | Question 5

     From amongst the following given scenarios determine the right one to justify interrupt mode of data-transfer: Source: nptel (A) Bulk transfer of several kilo-byte (B) Moderately large data transfer but more that 1 KB (C) Short events like mouse action (D) Key board inputs Answer: (C) (D) Explanation: Both keyboard and mouse controllers typically use interrupt mode. Quiz of this Question

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   • Operating Systems | Input Output Systems | Question 2

     We describe a protocol of input device communication below.a. Each device has a distinct addressb. The bus controller scans each device in sequence of increasing address value to determine if the entity wishes to communicate.c. The device ready to communicate leaves it data in IO register.d. The data is picked up and the controller moves to step-a above.Identify the form of communication best describes the IO mode amongst the following:Source: nptel(A) Programmed mode of data transfer(B) DMA(C) Interrupt mode(D) PollingAnswer: (D)Explanation: See Polling

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2. www.techtarget.com › whatis › definitionWhat is an Operating System (OS)? Definition, Types and Examples

   www.techtarget.com › whatis › definition

   An operating system (OS) is the program that, after being initially loaded into the computer by a boot program, manages all of the other application programs in a computer. The application programs make use of the operating system by making requests for services through a defined application program interface ( API ).

3. www.britannica.com › technology › operating-systemOperating system (OS) | Definition, Examples, & Concepts

   www.britannica.com › technology › operating-system

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   Mar 26, 2024 · operating system (OS), program that manages a computer’s resources, especially the allocation of those resources among other programs. Typical resources include the central processing unit (CPU), computer memory , file storage, input/output (I/O) devices , and network connections.

4. www.geeksforgeeks.org › operating-systemsOperating System Tutorial - GeeksforGeeks

   www.geeksforgeeks.org › operating-systems

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   Jan 25, 2024 · An Operating System (OS) is software that manages and handles the hardware and software resources of a computer system. It provides interaction between users of computers and computer hardware. An operating system is responsible for managing and controlling all the activities and sharing of computer resources. An operating system is a low-level ...

5. www.g2.com › articles › operating-systemWhat Is an Operating System (OS)? Types, Functions, and More - G2

   www.g2.com › articles › operating-system

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   Jan 13, 2023 · An operating system is a system software that, following the boot program, manages all hardware and software resources. It also provides services to different computer programs. Today, operating systems leverage device drivers to provide hardware environment-specific services.

6. www.howtogeek.com › 361572 › what-is-an-operating-systemWhat is an Operating System? - How-To Geek

   www.howtogeek.com › 361572 › what-is-an-operating-system

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   Aug 8, 2018 · An operating system is the primary software that manages all the hardware and other software on a computer. The operating system, also known as an "OS," interfaces with the computer's hardware and provides services that applications can use. What Does an Operating System Do?

7. www.coursera.org › articles › operating-systemWhat Is an Operating System? | Coursera

   www.coursera.org › articles › operating-system

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   Nov 29, 2023 · Security. Operating systems have specific features to prevent cyberattacks, encrypt files, and control who has access to certain files. Booting. Operating systems control the process of powering up systems. Disk management. The operating system manages all disks and drives installed in a computer such as flash drives and hard drives.

8. www.codecademy.com › learn › fundamentals-of-operating-systemsFundamentals of Operating Systems | Codecademy

   www.codecademy.com › learn › fundamentals-of-operating-systems

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   1. Introduction to Operating Systems. Learn about how computers process data, the important hardware in every computer, and the basic functionalities of an operating system. 2. Processes and Threads. Learn about how processes and threads work in an operating system. 3. Process Scheduling.