Re: Can this be done?

On 16 Nov 1994, Martin Allred wrote: > I was thinking, so look out. Can OnLine use a RAM-disk for the primary > database storage and put the mirror on a real disk? This should allow > for some serious speed improvements while keeping some integrity due > to the mirror of the database. If only. With 6.0 DSA mirrored writes are performed asynchronously, but I seem to remember that the I/O write will only be confirmed when both the primary and mirror have successfully written to thier respective chunks. In this case, you will always be waiting on the real-device, no matter how quickly the ram device returns. I remember someone telling me that 7.0 will confirm the moment either the primary or mirrored writes succed. Can anyone elaborate? > > If this is possible, can the read-from-both-copies-of-the-database > capability be turned off so reading is done only from RAM? > I don't think so. > Martin > > > -------------------------------------------------------------------------- > + Martin Allred "A little pain never hurt anyone." + > + Grass Valley Group /\\ /\\ + > + martina@gvgtsg.gvg.tek.com __/G \\/ G\\__ + > > > ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ Mark Lansley <mark@dsl.com> | "Whoa!....Maybe I'll just pass Druid Systems Ltd, UK | on my usual barking frenzy." +44 932 571212 (Vce) 571552 (Fax) | ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~