Justin, Thanks for the idea. I pulled down the source for multicorn and added that to it. I do not see parallel queries in the analyze output (unless I force it and then it only gets one worker), but it does look like it is reading more than one file at once if I go with a non-partitioned table that looks at all the files. Not any better if I have the table split up into partitions. So it’s better, but still curious if this would work with partitions. Thanks again. Pat > On Dec 18, 2018, at 22:51, Justin Pryzby <pryzby@xxxxxxxxxxxxx> wrote: > >> On Tue, Dec 18, 2018 at 08:39:36PM -0800, Patrick Mulrooney wrote: >> Wondering if anyone had any thoughts on how to tweak my setup to get it to >> read many files at once instead of one at a time when using file fdw and >> partitions. > > I found this: > > https://www.postgresql.org/docs/current/parallel-safety.html > |The following operations are always parallel restricted. > |Scans of foreign tables, unless the foreign data wrapper has an IsForeignScanParallelSafe API which indicates otherwise. > > https://github.com/ergo70/vcf_fdw/blob/master/vcf_fdw/__init__.py > => has no such API marker, since it's couple years old, same as multicorn. > > Justin
