Why don’t we write a database file system? Isn’t a file system practically a database already? Isn’t layering an OS between the data and the database application slowing things down?
In: Engineering
Computers that are specifically intended to be databases can use raw disk for the database storage and bypass OS filesystems and overhead. For multipurpose computers, this makes much less sense since you want to do things other than database “stuff”.
Most computers you will use are pretty multipurpose, so you’ll bear with the small amount of filesystem overhead. File systems are general purpose, so they suit the general purpose nature of most computing needs.
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