Hi Tomas,
Please find the below input for slow query.
(a) something about the hardware it's running on
RAM-->64 GB, CPU->40core
(b) amounts of data in the tables / databases
Database size :32GB
-----------------
Tables size
-----------------
Workflow.project : 8194 byte
workflow.tool_performance :175 MB
workflow.evidence_to_do :580 MB
(c) EXPLAIN or even better EXPLAIN ANALYZE of the query
"GroupAggregate (cost=16583736169.63..18157894828.18 rows=5920110 width=69)"
" -> Sort (cost=16583736169.63..16714893857.43 rows=52463075120 width=69)"
" Sort Key: tool_performance.project_id, project.project_name,
tool_performance.step_id, (date_trunc('day'::text,
tool_performance.insert_time)), tool_performance.user_id"
" -> Nested Loop (cost=2.42..787115179.07 rows=52463075120 width=69)"
" -> Seq Scan on evidence_to_do (cost=0.00..119443.95
rows=558296 width=0)"
" Filter: (status_id = ANY
('{15100,15150,15200,15300,15400,15500}'::bigint[]))"
" -> Materialize (cost=2.42..49843.24 rows=93970 width=69)"
" -> Hash Join (cost=2.42..49373.39 rows=93970 width=69)"
" Hash Cond: (tool_performance.project_id =
project.project_id)"
" -> Seq Scan on tool_performance
(cost=0.00..48078.88 rows=93970 width=39)"
" Filter: ((insert_time > '2017-05-01
00:00:00+05:30'::timestamp with time zone) AND (insert_time < '2017-05-02
00:00:00+05:30'::timestamp with time zone))"
" -> Hash (cost=1.63..1.63 rows=63 width=38)"
" -> Seq Scan on project (cost=0.00..1.63
rows=63 width=38)"
(d) configuration of the database (work_mem, shared_buffers etc.)
work_mem = 32MB
shared_buffers = 16GB
maintenance_work_mem = 8GB
temp_buffers = 64MB
max_connections=2000
Regards,
Dinesh Chandra
|Database administrator (Oracle/PostgreSQL)| Cyient Ltd. Noida.
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-----Original Message-----
From: [email protected]
[mailto:[email protected]] On Behalf Of Tomas Vondra
Sent: 24 May, 2017 10:56 PM
To: [email protected]
Subject: [EXTERNAL] Re: [PERFORM] Query is running very slow......
Hi,
On 5/24/17 7:04 PM, Dinesh Chandra 12108 wrote:
> Dear Expert,
>
> While executing the blow query, its taking too long time to fetch output.
>
> Could you please help to fine tune the same?
>
You'll have to provide far more details - the query alone is certainly not
enough for anyone to guess why it's slow. Perhaps look at this:
https://wiki.postgresql.org/wiki/Slow_Query_Questions
In particular, you'll have to tell us
(a) something about the hardware it's running on
(b) amounts of data in the tables / databases
(c) EXPLAIN or even better EXPLAIN ANALYZE of the query
(d) configuration of the database (work_mem, shared_buffers etc.)
regards
--
Tomas Vondra http://www.2ndQuadrant.com
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services
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