| From: | Andres Freund <andres(at)2ndquadrant(dot)com> |
|---|---|
| To: | Robert Haas <robertmhaas(at)gmail(dot)com> |
| Cc: | Heikki Linnakangas <hlinnakangas(at)vmware(dot)com>, Amit Kapila <amit(dot)kapila16(at)gmail(dot)com>, pgsql-hackers <pgsql-hackers(at)postgresql(dot)org>, Mike Blackwell <mike(dot)blackwell(at)rrd(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, Peter Geoghegan <pg(at)heroku(dot)com>, Claudio Freire <klaussfreire(at)gmail(dot)com> |
| Subject: | Re: Performance Improvement by reducing WAL for Update Operation |
| Date: | 2014-03-03 15:38:02 |
| Message-ID: | 20140303153802.GH23352@awork2.anarazel.de |
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| Lists: | pgsql-hackers |
On 2014-03-03 10:35:03 -0500, Robert Haas wrote:
> On Mon, Mar 3, 2014 at 9:57 AM, Andres Freund <andres(at)2ndquadrant(dot)com> wrote:
> > Hm, I think all it needs to do disable delta encoding if
> > need_tuple_data (which is dependent on wal_level=logical).
>
> Why does it need to do that? The logical decoding stuff should be
> able to reverse out the delta encoding.
Against what should it perform the delta? Unless I misunderstand how the
patch works, it computes the delta against the old tuple in the heap
page?
Greetings,
Andres Freund
--
Andres Freund http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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