2008/11/7 Richard Huxton <[EMAIL PROTECTED]> > But it's this materialize that's taking the biggest piece of the time. > > > " -> Materialize (cost=469981.13..498937.42 rows=2316503 width=30) > > (actual time=15915.639..391938.338 rows=242752539 loops=1)" > > 15.9 seconds to 391.9 seconds. That's half your time right there. The > fact that it's ending up with 242 million rows isn't promising - are you > sure the query is doing what you think it is?
I am not. I can't see how materialize can multiply number of rows it gets from sort by 100. > > > " -> Sort (cost=469981.13..475772.39 rows=2316503 width=30) > (actual > > time=15915.599..19920.912 rows=2316503 loops=1)" > > " Sort Key: production.company.run_id" > > " Sort Method: external merge Disk: 104896kB" > > By constrast, this on-disk sort of 104MB is comparatively fast. >
