Thanks a lot Steve, that really answers my question.. 
Many thanks, Rijo Roy 

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  On Wed, 11 Jul 2018 at 7:50 pm, Steven 
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From: Rijo Roy []
Sent: 11 July 2018 15:14
To: Steven Winfield
Subject: RE: Extremely slow autovacuum:vacuum to prevent wraparound
Hi Steve, 
Apologies, I misread it as 2 billion, it is as you said set as 200 million 
which is the default value for the parameter autovacuum_freeze_max_age. 
I just wanted to confirm whether there would be any impact if I cancel or 
terminate the backend for the existing autovacuum :vacuum table_name (to 
prevent wraparound). I have initiated a normal vacuum manually but it is stuck 
on the table where the autovacuum is processing it. 
Rijo Roy
Stack Overflow confirms my memories about killing autovacuum - 
pg_cancel_backend() should be fine.

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