old_snapshot_threshold documentation

From: Peter Eisentraut <peter(dot)eisentraut(at)2ndquadrant(dot)com>
To: pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>
Subject: old_snapshot_threshold documentation
Date: 2016-08-26 18:34:27
Message-ID: a034222e-b737-68f7-68ea-61d00faad1b8@2ndquadrant.com
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I doubt the documentation for old_snapshot_threshold is going to be
understood by many ordinary users. What is a "snapshot", first of all?
Why would a snapshot be old? Why is that a problem? What can I do to
avoid it? What are the circumstances in practice where this issue would
arise, and what are the trade-offs? Where can I see existing snapshots
and how old they are?

--
Peter Eisentraut http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services

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