Re: Strange query behaviour between 9.4 and 12beta1

2019-06-04 Thread Tomas Vondra
On Tue, Jun 04, 2019 at 05:34:07PM +0300, Vasilis Ventirozos wrote: Hello everyone, I started comparing performance between postgres 9.4 and 12beta1 more specifically comparing the new (materialized) CTE. Are you saying the CTE is specified as MATERIALIZED in the query on 12? Because I don't s

Re: Shortest offline window on database migration

2019-06-04 Thread Stephen Frost
Greetings, * Haroldo Kerry (hke...@callix.com.br) wrote: > The bottleneck at dump is CPU (a single one, on a 44 thread server), as we > are using the -Fc option, that does not allow multiple jobs. > We tried some time ago to use the --jobs option of pg_dump but it was > slower, even with more thre

Strange query behaviour between 9.4 and 12beta1

2019-06-04 Thread Vasilis Ventirozos
Hello everyone, I started comparing performance between postgres 9.4 and 12beta1 more specifically comparing the new (materialized) CTE. The statements i use are application statements that i have little control over, Hardware is identical as both clusters are running on the same server, on the