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To: TGPTNDR who wrote (48953)	5/12/2002 4:19:34 PM
From: Charles Tutt	Read Replies (1) \| Respond to of 64865

Now I think I understand. It sounds like you were using semiconductor "disks," which one might call "RAM disks," but which are quite different from the PC nomenclature "RAM disks" I thought you meant. My impression was that semiconductor disks generally have battery backup, so are non-volatile (and hence would not need reloading), but perhaps not all of them are. Charles Tutt (SM)

To: TGPTNDR who wrote (48953)	5/13/2002 10:17:23 AM
From: rudedog	Respond to of 64865

tgptndr - HP OEMs a product from a sunnyvale company called, I think, DES, which makes a NV RAM disk. Performance using those systems just for log files can be 5 to 10 times better than similar systems with magnetic storage for the log. That assumes that the database system is large enough to be bottlenecked on log, which is often the case. Larger systems put the whole database on RAM disk, which is a further performance boost. But the OS and disk subsystem are still invoked, even though the "disk" I/O is very fast in those systems since they are actually RAM.