| From: | Juan José Santamaría Flecha <juanjo(dot)santamaria(at)gmail(dot)com> |
|---|---|
| To: | soumik(dot)bhattacharjee(at)kpn(dot)com |
| Cc: | eddy(dot)adarsh(at)gmail(dot)com, pgsql-admin(at)lists(dot)postgresql(dot)org |
| Subject: | Re: Postgres DB Slowness |
| Date: | 2019-08-23 11:08:24 |
| Message-ID: | CAC+AXB2=EA-iCdURZDxALoJUHsRi+dn0a=J6L26m=wPCSqnY5A@mail.gmail.com |
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| Lists: | pgsql-admin |
On Fri, Aug 23, 2019 at 10:17 AM <soumik(dot)bhattacharjee(at)kpn(dot)com> wrote:
>
> Query
> ===========
> SELECT
> i.*
> FROM
> npcurren.num_cps_instelling i,
> npcurren.num_aangesloten_nr n
> WHERE
> n.fk_exploit_nop_int_oper_id = 'PTT'
> AND i.telefoonnummer != n.anr_nummer_hoog
> AND i.telefoonnummer != n.anr_nummer_laag;
>
> Explain Plan
> ======================
> "Nested Loop (cost=2068.47..1769226624.33 rows=101090505159 width=73)"
>
This query looks wrong, resulting in a cartesian join.
As other people have pointed out, the execution times do not seem
reasonable, could you change the 'SELECT *' into a 'SELECT count(1)'
for the comparison?
Regards,
Juan José Santamaría Flecha
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