Flush File Buffers: What It Is and How It Works
What is Flush File Buffers?
Flush file buffers is a process of writing all the data from the buffer to the disk. Whenever we open a file, the operating system caches its content in a buffer because the hard disk is a slow storage media. This way, when we read or write data to the file, the data is not read or written directly on the hard disk but rather from or to the buffer in the memory. However, if we don't explicitly flush the buffer, the data remains unsaved on the disk even after the file is closed. In short, flushing file buffers is the process of writing cached data back to the disk.
How does it work?
When we write data to a file, the data is first cached in the buffer in memory and then gradually written back to the disk. However, we need to be extra cautious when closing a file because we need to ensure that all the data has been successfully written back to the disk. Otherwise, we might lose important data or create a situation where the data is partially written to the disk, causing corruption. Hence, flush file buffers is a necessary step when we want to ensures that our data integrity and consistency.
Why is it important?
Flush file buffers is essential in ensuring the integrity and safety of our data. Suppose a software program tells a user that a file was written successfully and closed but, in fact, the data has not yet been written to the disk. In that case, we might end up losing important data or running into corruption issues. By flushing file buffers, we ensure that the data is saved on the disk and backed up before the file is closed. Therefore, it's a best practice to always flush file buffers when closing files.
In conclusion, flush file buffers are essential processes in preserving the integrity and safety of our data. Always ensure that you flush your file buffers to prevent data loss, corruption, or other adverse effects.
