On 26/06/2014 11:04 PM, Alvaro Herrera wrote:
Ryan Johnson wrote:
As part of a research project, I'm trying to change Read Committed
isolation to use HeapTupleSatisfiesNow rather than acquiring a new
snapshot at every command [1].
Are you aware of this?

commit 813fb0315587d32e3b77af1051a0ef517d187763
Author: Robert Haas <rh...@postgresql.org>
Date:   Thu Aug 1 10:46:19 2013 -0400

     Remove SnapshotNow and HeapTupleSatisfiesNow.
That would be wonderful news... if snapshots weren't so darned expensive to create.

I guess there's no avoiding that bottleneck now, though.


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