On May 24, 2006, at 2:56 PM, Todd A. Cook wrote:
Tom Lane wrote:
"Todd A. Cook" <tcook@xxxxxxxxxxxxxxxxxxxxx> writes:
I have found that increasing maintenance_work_mem can decrease index
build speed on large tables:
You should probably re-measure when 8.2 comes out; we've fixed a
number
of performance issues in the sorting code that might cause that.
Thanks. I'll do that. If I can, I'll try it sooner on a build
from CVS.
If you'll be messing around with CVS, you might also want to try this
patch: http://jim.nasby.net/misc/pgsqlcompression/compress-sort.patch
(which was written by someone else). It hacks compression into the on-
disk sort code, which has shown a 50% speed improvement on my
machine. It should be fine to use for loading a database, but you
wouldn't want to leave it in for serious use (IIRC there's some cases
it flat-out doesn't handle right now).
You could probably apply that to 8.1.4 as well if you wanted to; it
should be fine for just loading the database.
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@xxxxxxxxxxxxx
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
