On 28 January 2015 at 14:03, Robert Haas <robertmh...@gmail.com> wrote:
> The problem here, as I see it, is that we're flying blind. If there's > just one spindle, I think it's got to be right to read the relation > sequentially. But if there are multiple spindles, it might not be, > but it seems hard to predict what we should do. We don't know what > the RAID chunk size is or how many spindles there are, so any guess as > to how to chunk up the relation and divide up the work between workers > is just a shot in the dark. Can't the planner take effective_io_concurrency into account? Thom
