On Wed, Jul 12, 2017 at 3:04 AM, Charles Nadeau <charles.nad...@gmail.com> wrote:
> Jeff, > > Here are the 2 EXPLAINs for one of my simplest query: > It looks like dstexterne and flowcompact are both views over flow. Can you share the definition of those views? I think the iowait > 12.5% is due to the parallel query execution. But then the question is, why is it only 25% when you have 10 fold parallelism? It certainly looks like you are doing more than 4MB/s there, so maybe something is wrong with the instrumentation, or how you are interpreting it. Although it is still less than perhaps it could do. To put a baseline on what you can expect out of parallel seq scans, can you do something like: explain (analyze, buffers) select avg(doctets) from flow; Cheers, Jeff
