Horton

Re: [PATCH] COPY .. COMPRESSED

Stephen Frost <sfrost@snowman.net>

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From: Stephen Frost <sfrost@snowman.net>
To: Claudio Freire <klaussfreire@gmail.com>
Cc: Peter Eisentraut <peter_e@gmx.net>, Tom Lane <tgl@sss.pgh.pa.us>, Simon Riggs <simon@2ndquadrant.com>, PostgreSQL-Dev <pgsql-hackers@postgresql.org>
Date: 2013-01-15T17:31:17Z
Lists: pgsql-hackers 
* Claudio Freire (klaussfreire@gmail.com) wrote:
> On Tue, Jan 15, 2013 at 1:08 PM, Stephen Frost <sfrost@snowman.net> wrote:
> > Where it does work well is when you move into a bulk-data mode (ala
> > COPY) and can compress relatively large amounts of data into a smaller
> > number of full-size packets to be sent.
> 
> Well... exactly. COPY is one case, big result sets is another.
> And packet headers can include whether each packet is compressed or
> not, which is quite transparent and easy to handle. There could even
> be a negotiation phase and make it backwards-compatible.

COPY and a large result set are the only cases, and a large result set
could easily be put inside of a COPY statement.  I agree that large
result sets outside of COPY could benefit from compression and perhaps
we can formulate a way to support that also.

	Thanks,

		Stephen