HDD vs SSD without explanation

2018-01-14 Thread Neto pr
Dear all Someone help me analyze the two execution plans below (Explain ANALYZE used), is the query 9 of TPC-H benchmark [1]. I'm using a server HP Intel Xeon 2.8GHz/4-core - Memory 8GB HDD SAS 320GB 15 Krpm AND SSD Sansung EVO 500GB. My DBMS parameters presents in postgresql.conf is default, but

Re: HDD vs SSD without explanation

2018-01-14 Thread Justin Pryzby
On Sun, Jan 14, 2018 at 12:44:00PM -0800, Neto pr wrote: > Dear all > > Someone help me analyze the two execution plans below (Explain ANALYZE > used), is the query 9 of TPC-H benchmark [1]. > > I'm using a server HP Intel Xeon 2.8GHz/4-core - Memory 8GB HDD SAS 320GB > 15 Krpm AND SSD Sansung EV

Re: HDD vs SSD without explanation

2018-01-14 Thread Neto pr
Thanks for the reply. I'll try upload the execution plan with Explain (analyse, buffer) for website: https://explain.depesz.com/ I'm make an experiment for a scientific research and this is what I find strange, explaining better, strange HDD performance far outweigh the performance of an SSD. Do

Re: HDD vs SSD without explanation

2018-01-14 Thread Neto pr
2018-01-14 13:40 GMT-08:00 Justin Pryzby : > On Sun, Jan 14, 2018 at 12:44:00PM -0800, Neto pr wrote: >> Dear all >> >> Someone help me analyze the two execution plans below (Explain ANALYZE >> used), is the query 9 of TPC-H benchmark [1]. >> >> I'm using a server HP Intel Xeon 2.8GHz/4-core - Mem

Re: HDD vs SSD without explanation

2018-01-14 Thread Neto pr
2018-01-14 15:59 GMT-08:00 Neto pr : > Thanks for the reply. > I'll try upload the execution plan with Explain (analyse, buffer) for > website: https://explain.depesz.com/ > Below is a new execution plan, with Analyze, BUFFERS. This time, without changing anything in the configuration of the DBMS

Re: HDD vs SSD without explanation

2018-01-14 Thread Justin Pryzby
On Sun, Jan 14, 2018 at 06:25:40PM -0800, Neto pr wrote: > > The query plan is all garbled by mail , could you resend? Or post a link > > from > > https://explain.depesz.com/ On Sun, Jan 14, 2018 at 06:36:02PM -0800, Neto pr wrote: > I was not able to upload to the site, because I'm saving the e