RE: Query Tunning related to function

["Kumar, Mukesh" <MKumar@xxxxxxxxxxxxxxxxx>]

Hi Rainer ,

 

We tried to create the partial ‘index on table but it did not help, and it is taking approx. 7 sec now.

 

Also we tried to force the query to use the index by enabling the parameter at session level

 

set enable_seqscan=false;

 

and it is still taking the time below is the explain plan for the same

 

https://explain.depesz.com/s/YRWIW#stats

 

Also we running the query which is actually used in application and above query is used in below query. Below is the explain plan for same.

 

 

https://explain.depesz.com/s/wktl#stats

 

Please assist

 

 

Thanks and Regards,

Mukesh Kuma

 

From: Ranier Vilela <ranier.vf@xxxxxxxxx>
Sent: Thursday, April 14, 2022 7:56 PM
To: Kumar, Mukesh <MKumar@xxxxxxxxxxxxxxxxx>
Cc: pgsql-performance@xxxxxxxxxxxxxx; MUKESH KUMAR <mukesh.kumar14@xxxxxxx>
Subject: Re: Query Tunning related to function

 

Em qui., 14 de abr. de 2022 às 08:01, Kumar, Mukesh <MKumar@xxxxxxxxxxxxxxxxx> escreveu:

Hi Team,

 

We are running the below query in PostgreSQL and its taking approx. 8 to 9 sec to run the query.

 

Query – 1

 

Select * from

  (

  Select payment_sid_c,

  lms_app.translate_payment_status(payment_sid_c) AS paymentstatus

  from

  lms_app.lms_payment_check_request

  group by payment_sid_c) a 

  where  paymentstatus in ('PAID', 'MANUALLYPAID')

 

 

The explain plan and other details are placed at below link for more information. We have checked the indexes on column but in the explain plan it is showing as Seq Scan which we have to find out.

 

 

https://explain.depesz.com/s/Jsiw#stats

 

 

This query is using a function translate_payment_status on column payment_sid_c whose script is attached in this mail

 

Could please anyone help or suggest how to improve the query performance.

You can try create a partial index that help this filter:

Filter: ((lms_app.translate_payment_status(payment_sid_c))::text = ANY ('{PAID,MANUALLYPAID}'::text[]))

 

See at:

https://www.postgresql.org/docs/current/indexes-partial.html

 

regards,

Ranier Vilela