Re: COPY and Volatile default expressions

On 15 April 2013 16:55, Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> wrote:
> Simon Riggs <simon(at)2ndQuadrant(dot)com> writes:
>> On 15 April 2013 16:24, David Fetter <david(at)fetter(dot)org> wrote:
>>> Do you have numbers on this, or ways to gather same? In other words,
>>> how do we know what resources (time, CPU cycles, disk seeks, etc.) are
>>> being consumed here?
>
>> The multi-insert optimisation for COPY is already there and works well
>> enough to have been committed.
>
> You seem to not have answered the question. Exactly what sort of
> performance gain might be possible, bearing in mind that anything that
> invokes a trigger (for instance) is unlikely to be amazingly fast
> anyway?

Forgive me, I assumed the list would be familiar with the optimization
and so be excited by the need for this.

I will implement as a kluge, test and report the results.

Loading data into a table with a SERIAL or UUID column is the main use
case, so I'll measure that.

--
Simon Riggs http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services