How does PostgreSQL recognise "deleted" tuples by using xmax ?

From: 纪晓曦 <sheepjxx(at)gmail(dot)com>
To: Postgres General Postgres General <pgsql-general(at)postgresql(dot)org>
Subject: How does PostgreSQL recognise "deleted" tuples by using xmax ?
Date: 2009-10-27 04:55:39
Message-ID: 37a11ce00910262155m6400e76eqf67bffcf93804b39@mail.gmail.com
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How does PostgreSQL recognise "deleted" tuples by using xmax ?

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