From: Dinesh Chandra 12108 <Dinesh.Chandra@cyient.com>
To: Tomas Vondra <tomas.vondra@2ndquadrant.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: FW: Re: Query is running very slow......
Date: Thu, 25 May 2017 12:26:54 +0000
Message-ID: <39b30cfde27a48898340a69940581727@cyient.com> (raw)
In-Reply-To: <4caed7cc-07d8-e364-78ca-7a96b9780a9d@2ndquadrant.com>
References: <3152be5a435f45649cef6bf9321beb9a@cyient.com>
<4caed7cc-07d8-e364-78ca-7a96b9780a9d@2ndquadrant.com>
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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.
------------------------------------------------------------------
Mobile: +91-9953975849 | Ext 1078 |dinesh.chandra@cyient.com
Plot No. 7, NSEZ, Phase-II ,Noida-Dadri Road, Noida - 201 305,India.
-----Original Message-----
From: pgsql-performance-owner@postgresql.org [mailto:pgsql-performance-owner@postgresql.org] On Behalf Of Tomas Vondra
Sent: 24 May, 2017 10:56 PM
To: pgsql-performance@postgresql.org
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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To: pgsql-performance@postgresql.org
Cc: Dinesh.Chandra@cyient.com, tomas.vondra@2ndquadrant.com
Subject: Re: FW: Re: Query is running very slow......
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