Re:

Hi,

it will be good if you could post the queries you use + the explain output.

Thanks

Le sam. 9 févr. 2019 à 17:46, Evandro Abreu <evandro(dot)abreu(at)gmail(dot)com> a
écrit :

> I have a report that takes about 20 minutes to generate. It is generated
> from 3 tables: according to image.
> The report input parameter is a date range. So to generate it I select all
> records in Table A and run them
> in loop-for. For each record in Table A I make a query Table B join with
> Table C where I filter the records through the date field and make the sum
> of the value field.
>
> Given this scenario, I would like your help in finding a solution that can
> reduce the generation time of this report. System developed in PHP /
> Laravel.
>
> PostgreSQL
> max_connections = 50
> shared_buffers = 4GB
> effective_cache_size = 12GB
> maintenance_work_mem = 1GB
> checkpoint_completion_target = 0.7
> wal_buffers = 16MB
> default_statistics_target = 100
> random_page_cost = 4
> effective_io_concurrency = 2
> work_mem = 83886kB
> min_wal_size = 1GB
> max_wal_size = 2GB
>
> Linux Server CentOS 7, Single Xeon 4-Core E3-1230 v5 3.4Ghz w / HT, 16GB
> RAM.
>
> I've already created indexes in the fields that are involved in the
> queries.
> Database schema
> [image: Untitled2.png]Report result
> [image: Untitled.png]
>
> --
> Atenciosamente,
>
> Evandro Abreu.
> Engenheiro de Sistemas at STS Informática Ltda.
> Google Talk: evandro.abreu
> Twitter: http://twitter.com/abreu_evandro
> Skype: evandro_abreu
> Facebook: Evandro Abreu <http://www.facebook.com/evandro.abreu.9>
> WhatsApp: +55 86 99929-1788
> Phone: +55 86 98835-0468
>
>