When is data within a file written to disk from the buffer cache? A.Whenever a file is modified by a process, if the O_SYNC flag is set for that open file. B.Periodically, usually dependent on a system daemon (if the block in the buffer cache is different from the disk image of the block). C.Whenever a user process issues the 'sync()' system call (if the block in the buffer cache is different from the disk image of the block). D.All of the above.

Solution: Given, When is data within a file written to disk from the buffer cache? A. Whenever a file is modified by a process, if the O_SYNC flag is set for that open file. B. Periodically, usually dependent on a system daemon (if the block in the buffer cache is different from the disk image of the block). C. Whenever a user process issues the 'sync()' system call (if the block in the buffer cache is different from the disk image of the block). D. All of the above.Correct answer is : D. All of the above. Explanation: Data within a file written to disk from the buffer cache Whenever a file is modified by a process, if the O_SYNC flag is set for that open file. When Periodically, usually dependent on a system daemon data within a file written to disk from the buffer cache. Whenever a user process issues the 'sync()' system call then also data within a file written to disk from the buffer cache. So correct option is : D. All of the above.

Answered: When is data within a file written to…

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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When is data within a file written to disk from the buffer cache?

	A.	Whenever a file is modified by a process, if the O_SYNC flag is set for that open file.
	B.	Periodically, usually dependent on a system daemon (if the block in the buffer cache is different from the disk image of the block).
	C.	Whenever a user process issues the 'sync()' system call (if the block in the buffer cache is different from the disk image of the block).
	D.	All of the above.

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