How does vacuum works in postgresql

From: Rama Krishnan <raghuldrag(at)gmail(dot)com>
To: Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: How does vacuum works in postgresql
Date: 2020-07-25 06:33:16
Message-ID: CAJWX+EOUHhndXHD=Seyf8rnnnTJX8c8OSi9EN6sOJQqyXpAo2Q@mail.gmail.com
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Hi Experts,

I read this tutorials blog on edb it says vacuum has three phases
1.ingest phase
2.pruning phase
3.cleaning phase

Apart from this blog, no one has explained about the vacuum working

I m getting confusion on each can anyone explain me

https://www.enterprisedb.com/postgres-tutorials/how-does-vacuum-work-postgresql

Thanks& Regards
RK

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