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.

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
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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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