problem with select *

From: bhuvan Mitra <bhuvanrjb(at)gmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: problem with select *
Date: 2015-08-24 07:04:07
Message-ID: CAMmryP6hje58W78UnaC0-gyi1VqnmFAPfhAN_kE_d_VipbBq1w@mail.gmail.com
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Hello,

I have a table with 12 columns and 20 Million rows. While writing the table
I do not find any problem but when reading that I have some issues faced.
When I perform a 'select * from table limit 14000000;' (selecting 14million
rows), it is working fine. If the limit value is 15000000, it is throwing
the error as 'out of memory'.

If the query is 'select * from table' , The process is getting killed by
displaying the message 'killed'.

Kindly tell me where it is going wrong. I have 6MB cache, 1.6GHz CPU, linux
14.04 OS, 8GB RAM.

Thanks.

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