| From: | Justin Pryzby <pryzby(at)telsasoft(dot)com> |
|---|---|
| To: | "Kotapati, Anil" <Anil_Kotapati(at)comcast(dot)com> |
| Cc: | "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>, "Kossi, Edem" <Edem_Kossi(at)comcast(dot)com>, "Yadav, Rahul" <Rahul_Yadav2(at)comcast(dot)com>, "Mukherjee, Pallavi (Contractor)" <Pallavi_Mukherjee(at)comcast(dot)com> |
| Subject: | Re: Help with tuning slow query |
| Date: | 2018-05-19 15:57:49 |
| Message-ID: | 20180519155749.GB30060@telsasoft.com |
| Views: | Raw Message | Whole Thread | Download mbox | Resend email |
| Thread: | |
| Lists: | pgsql-performance |
On Fri, May 18, 2018 at 08:32:55PM +0000, Kotapati, Anil wrote:
> We are facing issues with one of our query, when we use order by count it is taking lot of time to execute the query. To be precise it is taking 9 min to execute the query from table which has ~220 million records. Is there a way to make this query run faster and efficiently using order by count. Below is the query which I’m trying to run
>
> Select account_number, sum(count_of_event) as "error_count"
> FROM event_daily_summary
> group by account_number,event_date,process_name
> having event_date >= '2018-05-07'
> and process_name='exp90d_xreerror'
> order by sum(count_of_event) desc
> limit 5000
Would you provide the information listed here ? Table definition, query plan, etc
https://wiki.postgresql.org/wiki/Slow_Query_Questions
Also, why "HAVING" ? Shouldn't you use WHERE ?
Does the real query have conditions on event_date and process name or is that
just for testing purposes?
Justin
| From | Date | Subject | |
|---|---|---|---|
| Next Message | pavan95 | 2018-05-21 06:15:56 | Help me in reducing the CPU cost for the high cost query below, as it is hitting production seriously!! |
| Previous Message | Kotapati, Anil | 2018-05-18 20:32:55 | Help with tuning slow query |