Help with tuning slow query

From: "Kotapati, Anil" <Anil_Kotapati(at)comcast(dot)com>
To: "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org>
Cc: "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: Help with tuning slow query
Date: 2018-05-18 20:32:55
Message-ID: 0AA18957-DDD4-413C-AE3A-2D3FD5EF0028@comcast.com
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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

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