"Tom Burke" <lists(at)spamex(dot)com> writes:
> 1) Does the 25 minute update of 600K rows with an index on the
> email column still seem out of line or is there not much we can do?
Still seems out of line to me, but I'm unsure where the problem lies.
First off, is the system CPU-bound or I/O bound while this update
is running?
regards, tom lane