On Wed, 2010-09-29 at 08:44 -0400, Alvaro Herrera wrote:

> > So, I think "twice disk space of the sum of table and indexes" would be
> > the simplest explanation for safe margin.
> 
> Agreed.

Surely the peak space is x3?

Old space + sort space + new space.

-- 
 Simon Riggs           www.2ndQuadrant.com
 PostgreSQL Development, 24x7 Support, Training and Services


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