Re: filesystem dbfile vs raw device dbfile

on HP-UX, "raw" means a character device, which is really a "logical volume" in a "volume group". e.g. /dev/vg01/rlvol3

on HP-UX, by using "raw" instead of file system files, Oracle can use asynchronous i/o (via the ascync driver), and avoid the overhead/bottlenecks associated with a file system. any improvement in performance will likely be unnoticeable on a lightly loaded system, and less than 10% under a heavy load.

while some tout the inability to use standard os commands to manipulate raw partitions as a "disadvantage", i actually find this to be an "advantage" of raw partitions. for example, the "rm" command cannot be used to remove a raw partition from the system.

"a9509617" <taklam_at_graduate.hku.hk> wrote in message news:3A8FBBAE.69D6F121_at_graduate.hku.hk...
> Hi,
>
> I have a stupid questions...
>
> are raw device dbfile in unix means character device or it means block
> device?
>
> also, what will be the benefits using raw device dbfile? speed?
> relaiablity?
>
> thx all experts.
>
> ^_^
>
Received on Sun Feb 18 2001 - 16:57:34 CST