xmin horizon?

From: CS DBA <cs_dba(at)consistentstate(dot)com>
To: pgsql-general(at)postgresql(dot)org
Subject: xmin horizon?
Date: 2015-07-29 19:13:15
Message-ID: 55B925CB.8010606@consistentstate.com
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All;

The documentation for pg_stat_activity lists this column:

backend_xmin xid The current backend's xmin horizon.

Can someone point me to a better understanding on "xmin horizon"?

Thanks in advance

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