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help / color / mirror / Atom feedFrom: Bruce Momjian <[email protected]>
To: David Johnston <[email protected]>
Cc: PostgreSQL-development <[email protected]>
Subject: Idea for debug/recovery snapshots
Date: Wed, 13 Nov 2013 10:16:32 -0500
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On Tue, Nov 12, 2013 at 08:39:35PM -0500, Bruce Momjian wrote:
> > My specific wording is incoherent mostly because it really belongs to a
> > larger corpus that currently exists only in my head.
>
> Oh, OK, it sounds fine. The user really doesn't choose what timeline to
> see --- rather, it is the current xid at the time they take their
> snapshot and other running xids that controls that. You can control
> your transaction isolation level, but that only controls how often you
> take snapshots.
[ moved to hackers ]
Actually, it would be possible to allow snapshots that are equal to the
earliest active snapshot for the current database. I don't think it
would be useful in production, but perhaps for debugging or some
disaster recovery.
--
Bruce Momjian <[email protected]> http://momjian.us
EnterpriseDB http://enterprisedb.com
+ Everyone has their own god. +
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