> An unrestricted update will end up rewriting the whole table.
> It's advisable to run VACUUM afterward, so that the wasted
> space can be reclaimed. What version are you on? Do you have
> autovacuum enabled?
>
> Also, to take a step back, why do you try to keep the
> timestamps changing like that? Why not store the information
> you need in the record (e.g. insert time as well as the
> datum) and then compute the result you need using a SELECT
> (or make it a view for convenience)? Fundamentally, these
> records aren't changing, you are just trying to interpret
> them in the context of the current day. That should be done
> using a SELECT, not an UPDATE.
>
I like Jeff's idea of redefining the problem. If you need the data to contain dates in the last 30 days, you might want
toconsider storing an interval, then using a view that includes a calculation using CURRENT_DATE().
Regards,
Paul Bort
Systems Engineer
TMW Systems, Inc.
pbort@tmwsystems.com
216 831 6606 x2233
216 8313606 (fax)