Extremely slow autovacuum:vacuum to prevent wraparound

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От Rijo Roy
Тема Extremely slow autovacuum:vacuum to prevent wraparound
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Msg-id 1734155292.2575738.1531308820197@mail.yahoo.com
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Hi Experts, 

I am running a PG10.4 in a RHEL 6.9. The tables stored in my database are mainly used for reads and very less writes happen. I have recently joined this environment and as soon as I logged into the postgresql servers, checked for dead tuples and relfrozenids.. And almost all have reached the autovacuum_freeze_max_age of 2billion and autovacuum was disabled.. Last vacuum was run 3 months back. 
Today I got permission to vacuum the tables but for 3 tables, Postgresql has already started the vacuum freeze using the autovacuum daemon running to prevent wraparound and these tables have TB'S of data.
Experts, please confirm whether I can kill these sessions and run a manual vacuum job with parallel jobs. 

Thanks in advance. 

Regards, 

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