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
