On 09/30/11 2:09 AM, J.V. wrote:
> Some tables have millions of rows,
well, something like UPDATE tablename SET
id=generate_series(1,numberofrows); will update every row to a
sequential value. However, I have no idea how you would match the
foreign key references in other tables to these new sequence values.
anything that updates a field on a million rows will be causing every
row to be updated... postgres never updates anything in place, it will
be copying the whole row to a new one (this is how it implements MVCC,
and its fundamental to the architecture, there's nothing you can do to
override this behavior).
--
john r pierce N 37, W 122
santa cruz ca mid-left coast