Re: Online V7 and Parallel Queries

Jeremy Russell wrote: > > Is it true that PDQ, parallel queries in OnLine V7.x will use both > primary chunks and mirror chunks to retrieve data concurrently when > performing a query expected to return large volumes of data??? > > The reason for asking - trying to determine whether software mirroring > has advantages over hardware mirroring, in terms of overall speeds. I > thought that hardware mirroring is faster than letting Informix handle > the mirror processing - if however, the mirror chunk is also read, > then maybe the software approach is best. For optimal security, I'd prefer soft mirroring : hardware mirroring prevents you from disk failure (software does it too !), BUT it doesn't prevent someone to write silly data on your rootdbs with a dd (arg!). Now, this is MY point of view... -- Valery Fouques valou@hotmail.com SYSADM GOSPORT-FRANCE /\\oO/\\ _ __/| \\`O.o' "355/113 -- Not the famous irrational =(_ _)= number PI, but an incredible simulation!" U