On Fri, 2009-11-27 at 13:39 +0000, Simon Riggs wrote:
> On Tue, 2009-11-24 at 22:13 -0800, Jeff Davis wrote:
>
> > My disagreement with the row-by-row approach is more semantics than
> > performance. COPY translates records to bytes and vice-versa, and your
> > original patch maintains those semantics.
>
> The bytes <-> records conversion is a costly one. Anything we can do to
> avoid that in either direction will be worth it. I would regard
> performance as being part/most of the reason to support this.
>
Right. I was responding to an idea that copy support sending records
from a table to a function, or from a function to a table, which is
something that INSERT/SELECT can already do.
Our use case is a table to a remote table, so it would go something
like:
1. COPY TO WITH BINARY on local node
2. stream output bytes from #1 to remote node
3. COPY FROM WITH BINARY on remote node
The only faster mechanism that I could imagine is sending the records
themselves, which would be machine-dependent.
Regards,
Jeff Davis
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