Re: constraint exclusion with ineq condition (Re: server hardware tuning.)

Hi,

yes i accept , but when i will do for existing tables, i am facing issue.

I have created 100 Function , all the function having five table join(now all partition by date) , now its not possible to change where condition in all 100 Function.

so that i am trying any other possibilities are there.

Regards,

Suganthi Sekar

________________________________
From: Michael Lewis <mlewis(at)entrata(dot)com>
Sent: 15 February 2019 00:20:00
To: suganthi Sekar
Cc: Justin Pryzby; pgsql-performance(at)lists(dot)postgresql(dot)org
Subject: Re: constraint exclusion with ineq condition (Re: server hardware tuning.)

Yeah, the planner doesn't know that call_created_date can be limited on both tables unless you tell it specify it in the where condition as Laurenz said on another thread.

Michael Lewis

On Thu, Feb 14, 2019 at 7:35 AM suganthi Sekar <suganthi(at)uniphore(dot)com<mailto:suganthi(at)uniphore(dot)com>> wrote:
Both table Portion by same column call_created_date
________________________________
From: Michael Lewis <mlewis(at)entrata(dot)com<mailto:mlewis(at)entrata(dot)com>>
Sent: 14 February 2019 19:35:48
To: suganthi Sekar
Cc: Justin Pryzby; pgsql-performance(at)lists(dot)postgresql(dot)org<mailto:pgsql-performance(at)lists(dot)postgresql(dot)org>
Subject: Re: constraint exclusion with ineq condition (Re: server hardware tuning.)

What are these two tables partitioned by?

On Thu, Feb 14, 2019, 5:03 AM suganthi Sekar <suganthi(at)uniphore(dot)com<mailto:suganthi(at)uniphore(dot)com><mailto:suganthi(at)uniphore(dot)com<mailto:suganthi(at)uniphore(dot)com>> wrote:
Hi,

Thanks, i know if explicitly we give in where condition it is working.

i thought with below parameter in Postgresq11 this issue is fixed ?

enable_partitionwise_join to 'on';

what is the use of enable_partitionwise_join to 'on';

Thanks for your response.

Regards
Suganthi Sekar
________________________________
From: Justin Pryzby <pryzby(at)telsasoft(dot)com<mailto:pryzby(at)telsasoft(dot)com><mailto:pryzby(at)telsasoft(dot)com<mailto:pryzby(at)telsasoft(dot)com>>>
Sent: 14 February 2019 16:10:01
To: suganthi Sekar
Cc: pgsql-performance(at)lists(dot)postgresql(dot)org<mailto:pgsql-performance(at)lists(dot)postgresql(dot)org><mailto:pgsql-performance(at)lists(dot)postgresql(dot)org<mailto:pgsql-performance(at)lists(dot)postgresql(dot)org>>
Subject: Re: constraint exclusion with ineq condition (Re: server hardware tuning.)

On Thu, Feb 14, 2019 at 10:38:36AM +0000, suganthi Sekar wrote:
> u mean the below parameter need to set on . its already on only.
> alter system set constraint_exclusion to 'on';

No, I said:
> You can work around it by specifying the same condition on b.call_created_date:
> > AND b.call_created_date >='2017-11-01' AND b.call_created_date<'2017-11-30'