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* Help with tuning slow query
@ 2018-05-18 20:32 Kotapati, Anil <Anil_Kotapati@comcast.com>
0 siblings, 1 reply; 2+ messages in thread
From: Kotapati, Anil @ 2018-05-18 20:32 UTC (permalink / raw)
To: pgsql-performance; +Cc: Kossi, Edem <Edem_Kossi@comcast.com>; Yadav, Rahul <Rahul_Yadav2@comcast.com>; Mukherjee, Pallavi (Contractor) <Pallavi_Mukherjee@comcast.com>
Hi Team,
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
Thanks,
Anil
^ permalink raw reply [nested|flat] 2+ messages in thread
* Re: Help with tuning slow query
@ 2018-05-19 15:57 Justin Pryzby <pryzby@telsasoft.com>
parent: Kotapati, Anil <Anil_Kotapati@comcast.com>
0 siblings, 0 replies; 2+ messages in thread
From: Justin Pryzby @ 2018-05-19 15:57 UTC (permalink / raw)
To: Kotapati, Anil <Anil_Kotapati@comcast.com>; +Cc: pgsql-performance; Kossi, Edem <Edem_Kossi@comcast.com>; Yadav, Rahul <Rahul_Yadav2@comcast.com>; Mukherjee, Pallavi (Contractor) <Pallavi_Mukherjee@comcast.com>
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
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2018-05-18 20:32 Help with tuning slow query Kotapati, Anil <Anil_Kotapati@comcast.com>
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