Direct IO

From: Dave Haas <davidh_at_no.spam.hotmail.com>
Date: Sat, 23 Jun 2001 00:45:38 GMT
Message-ID: <SERY6.338$84.100633@news0.telusplanet.net>

Hi.

I have a question with regard to terminology. In several posts (and an argument I had with Howard a while ago :) people have used the term 'Direct IO'. To be perfectly honest I'm not exactly sure what that means. AFAIK the IO options are 1) file-system buffered and 2) Raw IO. I heard (or more to the point, read) a post that said something to the effect of '... direct I/O means that the buffer cache is not involved in the operation ...'. Does that have something to do with the sort-direct-write operation and the old SORT_WRITE_BUFFERS and SORT_WRITE_BUFFER_SIZE? I'm a little confused (as usual) ...

Dave Received on Fri Jun 22 2001 - 19:45:38 CDT