Subject: Re: PostgrSQL server : CPU and Memory
To: pgsql-general@postgresql.org
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From: John R Pierce <pierce@hogranch.com>
Message-ID: <8cc6480c-199e-c37a-736b-4aece76630ec@hogranch.com>
Date: Wed, 17 May 2017 21:03:10 -0700
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On 5/17/2017 8:50 PM, kaustubh kelkar wrote:
> I am a developer and I want to monitor metrics related to CPU and 
> Memory of PostgreSQL server only using SQL queries.

postgres itself doesn't track that level of OS specific stuff.

>
> Do we have any system tables which can give us the data? I have found 
> this one
> https://aaronparecki.com/2015/02/19/8/monitoring-cpu-memory-usage-from-postgres 
>
> but dont know whether it is exactly the same what I need.


thats reading the /proc/.... stuff available on Linux systems via SQL, 
its the same stuff OS level tools like ps, top, free use... it won't 
work on non-Linux systems, even other Unix systems like BSD don't have 
the same /proc stuff, and other OS's like Windows don't have /proc at all.

if you don't know whether that's what you need, I'm not sure how we 
could know what you need.

-- 
john r pierce, recycling bits in santa cruz


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