PS , in the meanwhile I discovered a 2nd workaround(beside disabling parallel processing) . I added offset 0 to the subquery , and, according to the documentation, “OFFSET 0 is the same as omitting the OFFSET clause” - https://www.postgresql.org/docs/current/static/queries-limit.html
cmd3dev=# show max_parallel_workers_per_gather ; *max_parallel_workers_per_gather* *---------------------------------* *8* (1 row) cmd3dev=# \timing Timing is on. cmd3dev=# SELECT * FROM (SELECT seg.circuit_id AS id, vendor_gtt_pop.vendor_id, CASE WHEN vendor_gtt_pop.push_to_gaa = 1 THEN 'Y' END as gaa, pop.gii_circuitid AS pop_name, cst.label AS pop_status, seg.a_company_name AS pop_location, seg.vendor_id AS pop_provider_id, seg.vendor_name AS pop_provider, cs.address1 AS pop_street, cs.city AS pop_city, cs.postal_code AS pop_postal_code, cs.state AS pop_state, csc.code AS pop_country, cs.country_id AS pop_country_id FROM ( SELECT c.gii_circuitid, max(so.id) AS service_order_id FROM service_order so join circuit c on c.product_id=so.product_id join master_service_order mso on mso.id=so.master_service_order_id WHERE NOT (so.ordertype_id = 2 AND so.status <> 999) AND NOT (so.ordertype_id = 3 AND so.status <> 999) AND c.status >= 20 AND c.status not in (160,999) AND mso.client_id=11615 AND c.service_description=28 AND c.status!=160 GROUP BY c.gii_circuitid ) pop JOIN service_order so ON so.id = pop.service_order_id left JOIN client_site cs on cs.id=so.a_site_id left JOIN country csc on csc.id=cs.country_id JOIN circuit c ON so.product_id=c.product_id JOIN circuit_status cst ON cst.id=c.status JOIN ( SELECT c.id AS circuit_id, sg.id AS segment_id, c.pop_support_vendor_id AS vendor_id, v.name AS vendor_name, sg.a_company_name FROM segment sg JOIN circuit_layout cl ON cl.segment_id = sg.id AND cl.ordinal = 1 JOIN circuit c ON c.id = cl.circuit_id JOIN vendor v ON v.id = c.pop_support_vendor_id ) seg ON seg.circuit_id = c.id JOIN vendor_gtt_pop on vendor_gtt_pop.gtt_pop_id = seg.circuit_id offset 0) foo where vendor_id = 12346 AND (1=1) ORDER BY pop_name ASC,id desc LIMIT 10; id | vendor_id | gaa | pop_name | pop_status | pop_location | pop_provider_id | pop_provider | pop_street | pop_city | pop _postal_code | pop_state | pop_country | pop_country_id --------+-----------+-----+---------------+------------+--------------+-----------------+--------------+---------------------+----------+---- -------------+-----------+-------------+---------------- 684807 | 12346 | Y | GTT/POP/LON1T | Active | LON1T | 12288 | Telehouse UK | 14 Coriander Avenue | London | E14 2AA | | GB | 219 (1 row) *Time: 2245.073 ms (00:02.245)* On Fri, Mar 23, 2018 at 9:31 AM, Alessandro Aste <alessandro.a...@gmail.com> wrote: > Tomas, I'm attaching a 4MB file with the perf report. Let me know if it > gets blocked, I'll shrink it to the first 1000 lines. > > Thank you, > > Alessandro. > > On Thu, Mar 22, 2018 at 11:42 PM, Tomas Vondra < > tomas.von...@2ndquadrant.com> wrote: > >> On 03/22/2018 11:29 PM, Alessandro Aste wrote: >> > Thanks Tomas. We're currently building postgres from source. In order to >> > enable symbols, you want me to re-configure postres with --enable-debug >> > then run perf? >> > >> >> Yes. >> >> regards >> >> -- >> Tomas Vondra http://www.2ndQuadrant.com >> PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services >> > >
