3 ms·How do database do I/O? Do they use the usual file api? Memory mapped files? Something else?by jules 16y agoHow do database do I/O? Do they use the usual file api? Memory mapped files? Something else?AlisdairO 16y agousually, they'll use standard unbuffered read and write calls, afaik. They don't use buffering because they usually manage their own caching.gaius 16y agoOracle 11g mounts NFS filesystems directly (i.e. it bypasses the OS).