On 16 October 2012 03:03, Christopher Browne <cbbrowne@gmail.com> wrote:
> There's a necessary trade-off; you can either have it globally
> *strongly* ordered, and, if so, you'll have to pay a hefty
> coordination price, or you can have the cheaper answer of a weakly
> ordered sequence. The latter leaves me feeling rather "meh."
Oracle allows you to define whether you want ORDER or not for a
sequence when used in clustered mode.
Requesting a sequence to be strongly ordered across a generic
distributed system is very much like asking performance=none and
high_availability=off, which is why I didn't suggest it. So you're
right about the "hefty coordination price" but our conclusions differ
because of our understanding of that price.
I don't think it makes sense to spend the time implementing that option.
-- Simon Riggs http://www.2ndQuadrant.com/PostgreSQL Development, 24x7 Support, Training & Services